chore: version packages

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

.github/workflows/ci.yml

@@ -91,6 +91,14 @@ jobs:
         # Safe in CI: TmuxManager no-ops all shell commands under VITEST (test/setup.ts).
         run: npm run test:ci
 
+      - name: Run xterm-zerolag-input package tests
+        # Layers 1-3 of the predictive-echo suites (unit laws, fixture replay,
+        # seeded fuzz): deterministic, no browser, no live server. Depends on
+        # the ROOT `npm ci` above — workspaces hoist the package's vitest into
+        # the root node_modules; do not add a separate install here.
+        run: npx vitest run
+        working-directory: packages/xterm-zerolag-input
+
 # Note: The browser-driven mobile suite (test/mobile/**) is excluded from CI —
 # it needs a live server + chromium + environment-specific PNG baselines.
 # Run it locally/manually. All other tests run via the `test` job above.

CHANGELOG.md

@@ -1,5 +1,59 @@
 # aicodeman
 
+## 1.15.0
+
+### Minor Changes
+
+- 55bff4a: Zero-lag predictive echo for Codex sessions (mosh-style write-through prediction).
+
+  Codex's per-keystroke composer forced 1.12.2 to disable the local-echo overlay (issues #218/#219/#220/#222), leaving Codex typing at full round-trip latency on remote links. This release adds a second echo mode instead of re-enabling the first: every keystroke still goes to the PTY exactly as before (byte-identical wire behavior, pinned by vm-level and end-to-end trace-equality tests), while the new `PredictiveEchoAddon` in `xterm-zerolag-input` 0.2.0 paints the predicted glyph at the predicted cell. When the real echo lands, the prediction is confirmed and its span removed (an invisible swap); mispredictions self-heal via a two-pass mismatch cascade and a TTL.
+  - Reconciliation reads the parsed terminal buffer, never the raw stream: full-line redraws, ECH gap painting and tmux's in-place deltas all converge to the same cells. Confirmation requires the cell match PLUS a cursor advance, so placeholder glyphs and identical repaints never false-confirm; blank cells are neutral (codex clears its placeholder on the first echo).
+  - Predictions paint only while the cursor sits on the measured Codex composer row (`/^› /`, codex-cli 0.147): trust/approval modals and wrapped continuation rows get no ghosts, deliberately falling back to real echo.
+  - Ships as a SEPARATE `vendor/xterm-predictive-echo.js` bundle: the existing zerolag bundle is byte-identical (sha256-verified), and a missing or broken bundle degrades Codex to exact 1.12.2 behavior. The per-device `localEchoEnabled` toggle is the kill switch.
+  - Claude/Gemini/OpenCode/Antigravity keep buffer mode untouched; shell stays off.
+  - A post-build adversarial review added the anchor-hold rule: after an unpredicted wire edit (backspace into echoed text, cleared input, IME text commits) new predictions hold until the next parsed write, so a stale displayed cursor can never mis-anchor a run.
+  - Tests: 55 new package tests including replay suites driven by fixtures recorded from a real codex TUI through the production tmux+strip pipeline (`scripts/dev/record-codex-frames.mjs`) and a 500-iteration seeded fuzz; new vm policy/wire-neutrality suites; a 10-scenario Playwright E2E against real codex covering the #218/#219/#220/#222 retests, byte-identity, and a simulated 300ms-RTT run. The package test suite now runs in CI.
+
+### Patch Changes
+
+- Agent-skill hardening, plus a fix for the mobile browser suite.
+
+  ## The Codeman agent skill
+
+  Twelve issues found by auditing the skill against a live instance, and fixing them meant measuring things rather than reasoning about them.
+
+  **Readiness now works in every permission mode.** The ladder matched `bypass`, which is the status bar of only ONE mode. Measured one pane per mode against claude-cli 2.1.226:
+
+  | how Codeman spawned it                     | statusline              | `shift+tab` | `bypass` |
+  | ------------------------------------------ | ----------------------- | ----------- | -------- |
+  | `--dangerously-skip-permissions` (default) | `bypass permissions on` | yes         | yes      |
+  | `--permission-mode auto`                   | `auto mode on`          | yes         | no       |
+  | `--allowedTools …`                         | `don't ask on`          | yes         | no       |
+  | neither (`normal`)                         | `don't ask on`          | yes         | no       |
+  | `--permission-mode plan`                   | `plan mode on`          | yes         | no       |
+
+  Every mode ends `(shift+tab to cycle)`, and the `claudeMode` setting is not exposed on `GET /api/v1/sessions/:id`, so there was nothing to branch on. The ladder matches `shift+tab` now: universal, and space-free, which is what makes it survive the TUI stream. A non-default worker used to be reported broken after burning the full budget. ⚠️ The `+` means it only works through `--data-urlencode`; a hand-built query silently searches for `shift tab`.
+
+  **`.status` is documented as unreliable in both directions.** Measured on a live worker reading `idle` while mid-turn and actively producing output, with `lastActivityAt` equal to the moment of the call. A worker that dies inside its pane also reads `idle`. Synchronize on `stop` or an output marker; to judge from outside, sample `terminal?tail=` twice and compare.
+
+  **The self-delete guard is fail-closed.** Documented in 1.14.2; the reference files and every recipe now route through it consistently.
+
+  **Reads work on macOS.** The ANSI-strip pipelines used `sed 's/\x1b…'`, and BSD sed has no `\xHH` escape, so on macOS they silently stripped nothing and handed the agent raw ANSI.
+
+  **Injection is atomic and no longer silent.** `installAgentSkillInto()` wrote each file with a bare `writeFile`, so two sessions created concurrently in one repo could leave a reader observing a truncated SKILL.md; writes now go through temp+rename under the same lock every sibling mutator uses. And both server call sites discarded the outcome, so a `foreign` refusal (a user-authored skill is present) or a `symlink` refusal was invisible: turning the setting on, seeing nothing, and having no way to find out why. Refusals are logged now; injection stays best-effort and still cannot fail session creation.
+
+  **Reference corrections**: the `FORBIDDEN` 403 row and which auth responses are plain text rather than the JSON envelope, the input size cap, the undocumented `killMux` parameter on DELETE, and the fact that zero, negative and non-integer timeouts are rejected with a 400 rather than clamped.
+
+  **README.zh-CN.md taught a recipe that could not work**: its input example had no trailing `\r`, so Enter was never sent and the prompt sat unsubmitted, and its read step used `/output`, whose `textOutput` is always empty for interactive sessions. Its agent section is now in line with the English one. CLAUDE.md's single-line gotcha also gained the `\r` rule.
+
+  **Tests**: the `codeman skill install`/`uninstall` CLI had none, including the linked-case resolution shipped in 1.14.2; the `POST /api/sessions` injection call site was never exercised because the shared route mock hardcoded the gate off; and nothing guarded `reference/endpoints.md` against drifting from the routes it documents. All three covered now.
+
+  ## Mobile browser suite
+
+  The suite drives a real browser against a server started from TypeScript source, so it serves `src/web/public`, while `npm run build` puts the xterm vendor bundles in `dist/web/public`. Without them every `/vendor/xterm*` request 404s, `Terminal` is never defined, and every test touching `app.terminal` dies on a null. A `pretest:mobile` step now prepares them.
+
+  Hardened after two review rounds, each defect reproduced: the freshness cache trusted mtime alone, so a bundle left without its alias tail (or truncated by an interrupted `npm install`) was reported "up to date" forever while the suite died on `LocalEchoOverlay is not defined`; it now verifies content and size, and repairs what an earlier run poisoned. Builds go to a temp file private to the run and rename into place, so a partial write can never be published and two concurrent runs cannot corrupt each other. Temps whose owning process is gone are reclaimed, and only those. Freshness tracks every input the bundle derives from, not just the entry, so editing a sibling of the addon no longer leaves the suite testing a stale overlay. `npx` runs with the repo as cwd, so it uses the pinned esbuild instead of fetching an unpinned one.
+
 ## 1.14.2
 
 ### Patch Changes

CLAUDE.md

@@ -74,7 +74,7 @@ When user says "COM":
 
 CI runs `npm run check:lockfile` on every push/PR, so lockfile drift fails the build even if the `version-packages` script is bypassed.
 
-**Version**: 1.14.2 (must match `package.json`)
+**Version**: 1.15.0 (must match `package.json`)
 
 ## Project Overview
 
@@ -120,7 +120,7 @@ Codeman is a Claude Code session manager with web interface and autonomous Ralph
 
 ## Common Gotchas
 
-- **Single-line prompts only** — `writeViaMux()` sends text+Enter separately; multi-line breaks Ink
+- **Single-line prompts only** — `writeViaMux()` sends text+Enter separately; multi-line breaks Ink. ⚠️ **Input must END with `\r` or Enter is never sent**: `sendInput()` only issues `send-keys Enter` when the payload contains a carriage return, a `\r`-less `POST /api/sessions/:id/input` still succeeds (send-and-wait even reports `delivered:true`) while the text sits unsubmitted on the composer, and any `wait` burns its whole timeout on a turn that never started. Embedded newlines are stripped, not rejected, so `"echo A\necho B\r"` runs the joined `echo Aecho B`
 - **ESM only** — Never `require()`, use `await import()`. `tsx` masks CJS/ESM issues in dev but production breaks
 - **Package ≠ product name** — npm: `aicodeman`, product: **Codeman**. Release renames tags accordingly. Both `aicodeman` and `codeman` bin aliases are installed (`package.json` `bin`)
 - **Global regex `lastIndex`** — Shared `g`-flag patterns in loops must reset `lastIndex = 0` first, or use the `execPattern()` helper in `utils/regex-patterns.ts` (resets automatically)
@@ -129,7 +129,7 @@ Codeman is a Claude Code session manager with web interface and autonomous Ralph
 - **Model choice flows via `settings.local.json`, NOT `--model` or env** — the App Settings **Claude Model** picker (`claudeModel` in `settings.json`) is read by `session-ui.js` at session create (wins over the legacy 1M-Opus toggles `opusContext1m`/`opusContext1mEnabled`), sent as the `modelOverride` payload field, and `updateCaseModel()` (`hooks-config.ts`) writes/deletes the `model` key in `<case>/.claude/settings.local.json`. This is the intended exception to the envOverrides rule above: model legitimately lives in `settings.local.json` (a soft default — in-session `/model` still works); env vars do not
 - **Multi-CLI prefix discipline** — env-var prefix is CLI-specific (`CLAUDE_CODE_*` vs `OPENCODE_*` vs `CODEX_*` vs `GEMINI_*` vs `ANTIGRAVITY_*`) and the `ALLOWED_ENV_PREFIXES` allowlist in `schemas.ts` enforces this. Gemini additionally allowlists the **broad `GOOGLE_*`** namespace (intentional: Vertex AI auth needs `GOOGLE_CLOUD_PROJECT`/`GOOGLE_APPLICATION_CREDENTIALS`/`GOOGLE_GENAI_USE_VERTEXAI`; it is the loosest allowlist entry, affecting only the user's own spawned CLI). When adding a setting, decide which CLI(s) it applies to and gate the env export accordingly. Never blanket-forward all prefixes. Resolver design pattern: `docs/opencode-integration.md`
 - **Zod `.optional()` rejects `null`** — accepts `undefined` only. When the frontend builds a request body with `JSON.stringify`, an explicit `null` field is preserved on the wire and fails validation with `INVALID_INPUT`. Convert `null` → `undefined` before stringifying (e.g. `field: value ?? undefined`), or declare the schema `.nullish()`. This has caused real shipped bugs twice
-- **`xterm-zerolag-input` is single-source** — the local-echo overlay source lives ONLY in `packages/xterm-zerolag-input/src/`, and is bundled into the **gitignored** `src/web/public/vendor/xterm-zerolag-input.js` (dev, by `scripts/postinstall.js`) and `dist/.../vendor/` (prod, by `scripts/build.mjs`). `app.js` only **consumes** it via `new LocalEchoOverlay(terminal)`; there is no inline copy. So: change the package source, then rerun the bundle step (`npm install` for dev, `npm run build` for prod). **Never hand-edit `app.js` for overlay behavior, and never commit the gitignored vendor bundle.** Always test on mobile after touching it. → [architecture-invariants#xterm-zerolag-input-is-single-source](docs/architecture-invariants.md#xterm-zerolag-input-is-single-source), `docs/local-echo-overlay-plan.md`
+- **`xterm-zerolag-input` is single-source** — BOTH echo addons live ONLY in `packages/xterm-zerolag-input/src/`, bundled into TWO **gitignored** vendor files: `vendor/xterm-zerolag-input.js` (buffer overlay, entry `zerolag-input-addon.ts`) and `vendor/xterm-predictive-echo.js` (codex write-through, entry `predictive-echo-addon.ts`) — dev by `scripts/postinstall.js`, prod by `scripts/build.mjs`. `app.js`/terminal-ui.js only **consume** them via `new LocalEchoOverlay(terminal)` / `new PredictiveEchoOverlay(terminal)`; there is no inline copy. So: change the package source, then rerun the bundle step (`npm install` for dev, `npm run build` for prod). **Never hand-edit `app.js` for overlay behavior, and never commit the gitignored vendor bundles.** Always test on mobile after touching it. → [architecture-invariants#xterm-zerolag-input-is-single-source](docs/architecture-invariants.md#xterm-zerolag-input-is-single-source), `docs/local-echo-overlay-plan.md`
 - **Default bind is loopback-only; non-loopback without a password starts but warns** — the server defaults to `--host 127.0.0.1`. Binding non-loopback (`--host`/`-H`/`CODEMAN_HOST`) without `CODEMAN_PASSWORD` starts anyway but prints a loud warning; `--allow-unauthenticated-network` / `CODEMAN_ALLOW_UNAUTHENTICATED_NETWORK=1` acknowledges it. ⚠️ The production systemd unit passes no `--host`, so prod binds **localhost only**: reach it via `tailscale serve`/tunnel to `127.0.0.1`. A loopback bind is reachable through a same-host tunnel but NOT by a browser hitting the box's LAN IP. `install.sh` is separate and prompts for the binding (defaulting to LAN + a password), and preserves the existing binding on re-runs. → [architecture-invariants#default-bind-and-the-non-loopback-warning-path](docs/architecture-invariants.md#default-bind-and-the-non-loopback-warning-path), `docs/security-architecture.md`
 - **Instance isolation / multi-instance attach danger** — the data dir (`~/.codeman`) and tmux socket (`tmux -L codeman`) are PROCESS-WIDE and shared by every Codeman on the machine, derived from `CODEMAN_INSTANCE` via `src/config/instance.ts`. ⚠️ A 2nd instance on the SAME socket **discovers and attaches PTYs to the first instance's live sessions**, resizing and mutating them. `$HOME` isolation is NOT enough because tmux is system-global. To run two instances, give each a distinct `CODEMAN_INSTANCE` (scopes dir + socket together), or set `CODEMAN_TMUX_SOCKET` + `CODEMAN_DATA_DIR` individually; `scripts/run-beta.sh` does this for a beta alongside prod. **Any new `~/.codeman/...` path MUST go through `dataPath()`**, never `join(homedir(), '.codeman', …)`. → [architecture-invariants#instance-isolation-and-the-multi-instance-attach-danger](docs/architecture-invariants.md#instance-isolation-and-the-multi-instance-attach-danger)
 - **node-pty's macOS `spawn-helper` ships without `+x`** (issues #6, #204): `node-pty@1.1.0` publishes `prebuilds/darwin-<arch>/spawn-helper` as mode 0644, and macOS launches every PTY through it, so a stock macOS install fails every session start with `Error: posix_spawnp failed.` **Linux can never reproduce it**: `spawn-helper` is an `OS=="mac"` gyp target and node-pty ships no Linux prebuild, so node-gyp always emits an executable helper there. ⚠️ Look in **`prebuilds/<platform>-<arch>/`**, not just `build/Release/`, which does not exist on macOS. Repair is a chmod, never a mandatory rebuild (that would require Xcode CLI tools and deletes `prebuilds/` before compiling): `npm run fix:node-pty` chmods every helper then proves it by really opening a PTY. `spawnPtyWithHelperRepair()` (`utils/node-pty-repair.ts`) wraps every `pty.spawn()` in `session.ts` and self-heals a broken install on the first failure. → [architecture-invariants#node-ptys-macos-spawn-helper-must-be-executable](docs/architecture-invariants.md#node-ptys-macos-spawn-helper-must-be-executable)
@@ -198,7 +198,7 @@ Codeman is a Claude Code session manager with web interface and autonomous Ralph
 
 **Docker cases**: a case can point at a **container**, with any of the five CLI backends running inside it. Like remote-SSH this is a **LOCATION OVERLAY on cases, never a sixth `SessionMode`**. Exactly one long-lived container **per case**, shared by all its sessions, so killing a session kills only that session's in-container tmux and **never** `docker stop` while siblings remain. The workspace is a real host dir bind-mounted at the **same absolute path**, which is what keeps file-routes/watchers on real host bytes and makes the in-container transcript projHash match the host. Credentials are **seeded** (RO mount, copied into the container once) rather than shared RW, so in-container CLIs never write refreshed tokens back to the host, and bind mounts are excluded from `docker commit` so exports stay secret-free. **NEVER a create-time `-e` for secrets, NEVER `--privileged`, NEVER the docker socket.** Config drift is detected via a label hash and a drifted launch is REFUSED rather than silently launched with stale config. ⚠️ On the loopback-only prod bind a container cannot reach 127.0.0.1, so in-container hooks need `CODEMAN_DOCKER_BRIDGE_HOOKS=1`; otherwise idle detection falls back to output-based. → [architecture-invariants#docker-cases](docs/architecture-invariants.md#docker-cases), `docs/docker-cases.md` (user guide), `docs/docker-cases-plan.md` (design)
 
-**External CLI modes (OpenCode, Codex, Gemini, Antigravity)**: `isExternalCliMode()` in `session.ts` gates Claude-specific behavior off (Ralph tracker, BashToolParser, token/CLI-info parsing, ❯-prompt readiness); these CLIs render their own TUIs, so readiness is output stabilization instead. All four **require tmux with no direct PTY fallback**, because secrets are injected via socket-scoped `tmux setenv` and never on the spawn command line. ⚠️ `run*()` in `session-ui.js` MUST unwrap the `{success,data}` envelope; reading the raw shape silently breaks the run. ⚠️ **The local-echo overlay is DISABLED for codex sessions** (`_updateLocalEchoState` in terminal-ui.js, same branch as shell): codex's composer reacts per keystroke ("/" pops a live-filtering picker, arrows edit server-side state, the composer grows as it wraps), so buffer-until-Enter starved it into issues #218/#219/#220/#222. Codex also **drops keystrokes that share a PTY read with a bracketed paste**, so flushed text and the paste sequence must go out as separate delayed writes (mirroring the Enter branch's delayed `\r`). Tests: `test/local-echo-codex-gating.test.ts`. → [architecture-invariants#external-cli-modes-opencode-codex-gemini](docs/architecture-invariants.md#external-cli-modes-opencode-codex-gemini)
+**External CLI modes (OpenCode, Codex, Gemini, Antigravity)**: `isExternalCliMode()` in `session.ts` gates Claude-specific behavior off (Ralph tracker, BashToolParser, token/CLI-info parsing, ❯-prompt readiness); these CLIs render their own TUIs, so readiness is output stabilization instead. All four **require tmux with no direct PTY fallback**, because secrets are injected via socket-scoped `tmux setenv` and never on the spawn command line. ⚠️ `run*()` in `session-ui.js` MUST unwrap the `{success,data}` envelope; reading the raw shape silently breaks the run. ⚠️ **Codex sessions use PREDICTIVE WRITE-THROUGH echo, never the buffer overlay** (`_localEchoPolicy` in `_updateLocalEchoState`, terminal-ui.js): codex's composer reacts per keystroke ("/" pops a live-filtering picker, arrows edit server-side state, the composer grows as it wraps), so buffer-until-Enter starved it into issues #218/#219/#220/#222 and stays disabled (`_localEchoEnabled` remains false for codex). Instead, `PredictiveEchoAddon` (separate `vendor/xterm-predictive-echo.js` bundle) paints each keystroke at the predicted cell while the wire path stays BYTE-IDENTICAL: the onData hook (`_predictHookOnData`) is a plain statement with no `return`, so control always falls through into the untouched send path — pinned by vm and E2E byte-identity tests. Predictions reconcile against the parsed buffer and only while the cursor sits on the measured composer row (`isCodexComposerRow`, `/^› /`). Codex also **drops keystrokes that share a PTY read with a bracketed paste**, so flushed text and the paste sequence must go out as separate delayed writes (mirroring the Enter branch's delayed `\r`). Tests: `test/local-echo-codex-gating.test.ts`, `test/codex-predictive-echo.test.ts` (E2E vs real codex), `packages/xterm-zerolag-input/test/codex-replay.test.ts`. → [architecture-invariants#external-cli-modes-opencode-codex-gemini](docs/architecture-invariants.md#external-cli-modes-opencode-codex-gemini)
 
 **Run launch synchronization**: the Run entrypoint holds an in-flight lock and disables `#runBtn` for the whole launch (≥500ms), so a double click cannot create duplicate sessions with the same `w<n>-<case>` name. `_ensureCreatedSessionVisible()` runs before `selectSession()`, and `_onSessionCreated()` stays an idempotent upsert, so POST-first and SSE-first ordering both produce exactly one rendered tab. → [architecture-invariants#run-launch-synchronization](docs/architecture-invariants.md#run-launch-synchronization)
 

README.zh-CN.md

@@ -657,6 +657,16 @@ sc -l           # 列出会话
 
 面向不经浏览器控制 Codeman 的 AI 智能体与自动化：一个拉起工作会话的智能体、一个 CI 机器人，或是**运行在 Codeman 会话*内部*、编排其他会话的 Claude Code**。UI 能做的一切都是 HTTP + CLI，因此智能体也能做。
 
+> **捷径：装上打包好的智能体技能。** 下面这一整套（外加多工作会话的实战配方）已经作为 Claude Code 技能随仓库发布在 [`skills/codeman`](skills/codeman/SKILL.md)，会话内部的智能体不必等你把文档粘进提示词就能驱动 Codeman。三种获取方式：
+>
+> - `npx skills add Ark0N/Codeman --skill codeman -g`：全局安装，任何支持技能的智能体都能用
+> - `codeman skill install`（全局）或 `codeman skill install --case <name>`：给那些从 npm 安装、从未克隆过仓库的用户；`codeman skill uninstall` 可撤销
+> - **App Settings → Agent Skill**（`agentSkillEnabled`，默认关闭）：开启后，Codeman 会在每次于某个 case 中创建 Claude 会话时把技能注入该 case；case 里用户自己写的 `skills/codeman` 永远不会被覆盖
+>
+> 全局安装（`codeman skill install` 或 `npx skills add`）会被**本机每一个新建的 Claude Code 会话**读到，无论它在不在 Codeman 里。技能自带门禁：不在 Codeman 会话中（`CODEMAN_MUX` 未设置）时它拒绝动作，所以全局装上它对无关会话没有代价。
+>
+> ⚠️ 把 `agentSkillEnabled` 关回去**不会删掉已经注入的副本**（在创建时做清扫，会把技能从共用同一个 `.claude/` 目录的其他活动会话脚下抽走）。要删就按 case 删：`codeman skill uninstall --case <name>`。
+
 ### 检测自己身处 Codeman 内部
 
 当 CLI 运行在 Codeman 受管会话中时，以下环境变量会被设置 —— 读取它们，别硬编码任何东西：
@@ -670,15 +680,21 @@ sc -l           # 列出会话
 
 ### 行路规则（POST 之前先读）
 
-1. **只发单行输入。** 编程输入会作为字面文本 **+ Enter** 一次性发送。多行字符串会破坏智能体 TUI（Ink）—— 发送一行，或拆成多次调用。
+1. **只发单行输入，而且必须以 `\r` 结尾。** 编程输入按字面文本发送，**只有当输入里含回车符时才会触发 Enter**：`{"input":"run tests\r"}`。少了 `\r`，文本就停在会话的输入框里不被提交（同一次调用里的 `wait` 还会在一个压根没开始的回合上耗满整个超时）。内嵌的换行会被剥掉而不是报错，因此 `"echo A\necho B\r"` 执行的是拼起来的 `echo Aecho B`：一次调用只发一行。
 2. **让输入幂等。** 在 `POST …/input` 上带上稳定的 `clientId` 和按会话单调递增的 `seq`。服务端会去重，因此连接中断后的重试不会重复投递提示。
-3. **认证。** 若设置了 `CODEMAN_PASSWORD`，发送 HTTP Basic 认证（用户 `admin` 或 `CODEMAN_USERNAME`）或 `codeman_session` cookie。默认的环回安装无密码。缺失的 `Origin` 头被允许，因此普通 `curl` 可用；跨站的浏览器 origin 会被拒绝（CSRF 防护）。
+3. **认证。** 若设置了 `CODEMAN_PASSWORD`，发送 HTTP Basic 认证（用户 `admin` 或 `CODEMAN_USERNAME`）或 `codeman_session` cookie。默认的环回安装无密码。缺失的 `Origin` 头被允许，因此普通 `curl` 可用；跨站的浏览器 origin 会被拒绝（CSRF 防护）。⚠️ `401` 回的是裸字符串 `Unauthorized`，**不是** JSON 信封，直接喂给 `jq` 只会抛解析错误而看不到真正的失败原因：先看状态码，再解析。
 4. **响应信封。** 多数端点返回 `{ "success": true, "data": … }`（错误：`{ "success": false, "error", "errorCode" }`）。少数遗留 GET 返回裸响应体 —— **两种都要处理**（`body.data ?? body`）。
 5. **`/api/v1/*`** 是 `/api/*` 的稳定别名。
+6. **用等待代替轮询，别把超时当成错误。** 等待类端点在没等到事情发生时也以 HTTP `200` 加 `wait.timedOut: true` 应答，所以要循环调用短等待（默认 60 秒），而不是发一个超长的调用：隧道会掐断空闲连接。`wait.timeoutMs` 告诉你服务端钳制之后真正采用的超时（上限 600 秒）。
+7. **只有 `claude` 会话会发出 `stop` 与 `blocked`。** 这两个来自 Claude Code hook；`shell` 与外部 CLI（opencode/codex/gemini/antigravity）只接受 `idle`、`working` 与 `exit`。在这些模式上显式索要 `stop` 会得到 `400`；不传 `until` 则永远安全。⚠️ `shell` 会话的 `idle` 只在启动时触发**一次**，此后再也不会，所以在那里用「发送并等待」只能等到超时：没有 hook 的会话请用 `wait-output` 标记来同步。
+8. **没有任何东西会报告「就绪」，得自己显式等。** 新会话在 PID 出现之前一律回答 `{"signal":"exit","immediate":true}`（意思是*还没启动*，不是*崩了*），而全新 case 里的 `claude` 工作会话接着会停在 CLI 的信任对话框上。此时给它发提示，等待会在约 2 秒后因 `idle` 解除，看上去和一个跑完的回合一模一样，而文本其实卡在对话框里。下面的配方 2b 就是避开它的顺序。
 
 ### 常用配方
 
 ```bash
+# 每个 Codeman 会话里都自动设好了 CODEMAN_API_URL，协议也是对的。
+# 下面的兜底值适用于标准安装；在 --https 安装上请自己写 https:// 的地址，
+# 并给每个 curl 加上 -k（自签名证书）。
 API="${CODEMAN_API_URL:-http://127.0.0.1:3000}"
 # （若设置了密码，给每个调用加上  -u admin:"$CODEMAN_PASSWORD"）
 
@@ -690,18 +706,69 @@ curl -s -X POST "$API/api/quick-start" \
   -H 'Content-Type: application/json' \
   -d '{"caseName":"refactor-auth","mode":"claude","effort":"high"}' | jq
 
+# 2b. 等这个工作会话真正就绪（见规则 8）：先探输入框的标记，信任对话框只作兜底。
+#     （反过来先探信任对话框、再盲发一个 Enter，在重复运行时会误伤：对话框的文字
+#     会一直留在缓冲区里，探测因此匹配到旧文本，而那个 Enter 落进了已经就绪的输入框。）
+#     匹配单个词：TUI 的文字到达匹配器时可能已经丢掉了词间空格。
+until [ "$(curl -s "$API/api/sessions/$SID" | jq '.data.pid')" != null ]; do sleep 1; done
+R=$(curl -sG "$API/api/sessions/$SID/wait-output" --data-urlencode 'match=bypass' \
+      --data-urlencode 'from=buffer' --data-urlencode 'timeout=5000')
+if ! jq -e '.data.wait.matched' <<<"$R" >/dev/null; then
+  T=$(curl -sG "$API/api/sessions/$SID/wait-output" --data-urlencode 'match=trust' \
+        --data-urlencode 'from=buffer' --data-urlencode 'timeout=2000')
+  jq -e '.data.wait.matched' <<<"$T" >/dev/null && \
+    curl -s -X POST "$API/api/sessions/$SID/input" -H 'Content-Type: application/json' \
+      -d '{"input":"\r","useMux":true}'        # 接受首次运行的信任对话框
+  curl -sG "$API/api/sessions/$SID/wait-output" --data-urlencode 'match=bypass' \
+    --data-urlencode 'from=buffer' --data-urlencode 'timeout=45000' >/dev/null
+fi
+
 # 3. 向会话发送提示（精确一次：clientId + seq）
 curl -s -X POST "$API/api/sessions/$SID/input" \
   -H 'Content-Type: application/json' \
-  -d '{"input":"Run the test suite and summarize failures","useMux":true,"clientId":"agent-1","seq":1}'
+  -d '{"input":"Run the test suite and summarize failures\r","useMux":true,"clientId":"agent-1","seq":1}'
 
-# 4. 读回终端内容
-curl -s "$API/api/sessions/$SID/output" | jq -r '.data // .'
+# 4. 发送提示并阻塞到这一回合结束（先注册等待再写入，因此不会拿上一回合的状态来应答）
+curl -s -X POST "$API/api/sessions/$SID/input" \
+  -H 'Content-Type: application/json' \
+  -d '{"input":"Run the test suite and summarize failures\r","useMux":true,
+       "clientId":"agent-1","seq":2,"wait":"stop,exit","waitTimeout":60000}' \
+  | jq '.data.wait'      # -> {"signal":"stop","timedOut":false,"waitedMs":41230,...}
+#    （`stop` 是回合结束的权威 hook。加上 `idle` 会让它在转圈停顿时也解除，
+#      任何重画出 ❯ 提示符的东西同理，比如一个对话框。）
 
-# 5. 流式接收实时事件（会话输出、智能体活动、状态）
+# 4b. 超时了？那是 200，不是失败。循环调用短等待即可。
+curl -s "$API/api/sessions/$SID/wait?until=stop,exit&timeout=60000" | jq '.data.wait'
+
+# 4c. 或者等输出里出现某个标记（shell 会话也适用）。
+#     ⚠️ 每次调用都要用不同的标记（tmux 重画会重放旧屏幕文字），并且把标记拆开写，
+#     让敲进去的那一行本身不包含它：你自己的按键会回显进输出流，不拆开的标记会在
+#     命令还没跑之前就匹配上。from=buffer 用来接住在等待落地之前就已打印的标记。
+N=$RANDOM
+curl -s -X POST "$API/api/sessions/$SID/input" -H 'Content-Type: application/json' \
+  -d "{\"input\":\"M=DONE; npm test; echo \${M}_$N rc=\$?\r\",\"useMux\":true}"
+curl -sG "$API/api/sessions/$SID/wait-output" \
+  --data-urlencode "match=DONE_$N" --data-urlencode 'from=buffer' \
+  --data-urlencode 'timeout=60000' | jq '.data.wait'
+
+# 5. 读回答案。claude / codex 会话用 last-response：它取自 transcript 而不是屏幕，
+#    因此不带 TUI 的画框与重画噪声。⚠️ 要轮询，别只读一次：transcript 落盘比 stop
+#    信号稍晚，紧跟着「发送并等待」返回后立刻读，常常拿到空串。
+for _ in $(seq 1 10); do
+  TXT=$(curl -s "$API/api/sessions/$SID/last-response" | jq -r '.data.text')
+  [ -n "$TXT" ] && break; sleep 1
+done
+printf '%s\n' "$TXT"
+
+# 5b. 其他模式（shell/opencode/gemini/antigravity）没有 transcript，读终端。
+#     ⚠️ 用 terminal?tail=，不要用 /output：后者的 textOutput 对每个由 tmux 承载的
+#     （也就是每个交互式）会话都是空的。tail 按字节计，返回的是含 ANSI 的终端数据。
+curl -s "$API/api/sessions/$SID/terminal?tail=8000" | jq -r '.data.terminalBuffer'
+
+# 6. 流式接收实时事件（会话输出、智能体活动、状态）
 curl -sN "$API/api/events"          # Server-Sent Events
 
-# 6. 调度周期性工作（cron 风格任务）
+# 7. 调度周期性工作（cron 风格任务）
 curl -s -X POST "$API/api/cron/jobs" \
   -H 'Content-Type: application/json' \
   -d '{"name":"nightly-deps","agentType":"claude","workingDir":"/home/me/proj",
@@ -709,11 +776,11 @@ curl -s -X POST "$API/api/cron/jobs" \
        "inputMode":"typed","scheduleType":"daily","dailyTime":"03:00",
        "enabled":true,"concurrencyPolicy":"warn_only"}' | jq
 
-# 7. 查看后台子智能体及其活动记录
+# 8. 查看后台子智能体及其活动记录
 curl -s "$API/api/subagents" | jq '.data // .'
 curl -s "$API/api/subagents/$AID/transcript" | jq -r '.data // .'
 
-# 8. 全系统快照（会话、设置、重生、统计）
+# 9. 全系统快照（会话、设置、重生、统计）
 curl -s "$API/api/status" | jq
 ```
 
@@ -739,20 +806,23 @@ Codeman 会注册 Claude Code hook，它们 `POST /api/hook-event`（`permission
 
 ## API
 
-基于 Fastify 的 REST —— **20 个路由模块中约 190 个处理器**，外加一条 SSE 流和一条 WebSocket 终端通道。所有响应都使用 `ApiResponse<T>` 信封（`{success, data}` / `{success, error, errorCode}`）；`/api/v1/*` 是稳定别名。以下是一个有代表性的子集：
+基于 Fastify 的 REST —— **21 个路由模块中约 200 个处理器**，外加一条 SSE 流和一条 WebSocket 终端通道。所有响应都使用 `ApiResponse<T>` 信封（`{success, data}` / `{success, error, errorCode}`）；`/api/v1/*` 是稳定别名。以下是一个有代表性的子集：
 
 ### 会话（Sessions）
 
-| 方法     | 端点                       | 说明                                                                           |
-| -------- | -------------------------- | ------------------------------------------------------------------------------ |
-| `GET`    | `/api/sessions`            | 列出全部                                                                       |
-| `POST`   | `/api/quick-start`         | 创建 case + 启动会话（`{caseName?, mode?, effort?, envOverrides?}`）           |
-| `POST`   | `/api/sessions/:id/input`  | 发送输入（`{input, useMux?, clientId?, seq?}` —— `clientId`+`seq` = 精确一次） |
-| `GET`    | `/api/sessions/:id/output` | 读取终端输出                                                                   |
-| `GET`    | `/api/sessions/unified`    | 统一的活动 + 历史清单（会话管理器）：`?q=&limit=`                              |
-| `POST`   | `/api/sessions/:id/pin`    | 在会话管理器中置顶 / 取消置顶（`{pinned}`）                                    |
-| `PUT`    | `/api/session-order`       | 跨设备同步标签顺序（`{order: [ids]}`）                                         |
-| `DELETE` | `/api/sessions/:id`        | 删除会话                                                                       |
+| 方法     | 端点                            | 说明                                                                                                                         |
+| -------- | ------------------------------- | ---------------------------------------------------------------------------------------------------------------------------- |
+| `GET`    | `/api/sessions`                 | 列出全部                                                                                                                     |
+| `POST`   | `/api/quick-start`              | 创建 case + 启动会话（`{caseName?, mode?, effort?, envOverrides?}`）                                                         |
+| `POST`   | `/api/sessions/:id/input`       | 发送输入（`{input, useMux?, clientId?, seq?, wait?, waitTimeout?}`：`clientId`+`seq` = 精确一次；`wait` 阻塞到这一回合结束） |
+| `GET`    | `/api/sessions/:id/terminal`    | 读取终端输出（`?tail=<bytes>`、`?full=1`）：交互式会话的读取路径                                                             |
+| `GET`    | `/api/sessions/:id/output`      | 一次性的解析输出（tmux 承载的会话里 `textOutput` 为空）                                                                      |
+| `GET`    | `/api/sessions/:id/wait`        | 阻塞到某个信号触发（`?until=stop,idle,exit&timeout=&fresh=`）；超时是 `200`                                                  |
+| `GET`    | `/api/sessions/:id/wait-output` | 阻塞到某个字面串出现（`?match=&nocase=&from=now\|buffer&timeout=`）                                                          |
+| `GET`    | `/api/sessions/unified`         | 统一的活动 + 历史清单（会话管理器）：`?q=&limit=`                                                                            |
+| `POST`   | `/api/sessions/:id/pin`         | 在会话管理器中置顶 / 取消置顶（`{pinned}`）                                                                                  |
+| `PUT`    | `/api/session-order`            | 跨设备同步标签顺序（`{order: [ids]}`）                                                                                       |
+| `DELETE` | `/api/sessions/:id`             | 删除会话                                                                                                                     |
 
 ### 重生（Respawn）
 

config/vitest.ci.config.ts

@@ -25,6 +25,7 @@ export default defineConfig({
       'test/opencode-resize.test.ts', // browser (Playwright)
       'test/webgl-fallback.test.ts', // browser (Playwright)
       'test/terminal-copy-shortcut.test.ts', // browser (Playwright)
+      'test/codex-predictive-echo.test.ts', // browser (Playwright) + real codex binary
     ],
     setupFiles: ['./test/setup.ts'],
     fileParallelism: false,

docs/agent-control-plan.md

@@ -1,10 +1,12 @@
 # Agent Control Plan: skill packaging + wait primitives
 
-**Status**: steps 1 to 6 IMPLEMENTED, uncommitted as of 2026-08-09. Steps 1 to 5 were
-multi-round verified on 2026-08-08; step 6 (CLI install command + per-case injection +
-`agentSkillEnabled`) was built 2026-08-09; see the step-6 entry at the end of
-[§7 Build log](#7-build-log-what-actually-happened) for what shipped, what each
-verification round found, and what is still open.
+**Status**: steps 1 to 8 DONE and RELEASED. The wait primitives and the skill itself
+(steps 1 to 5) shipped in **1.13.0**; the `codeman skill install` CLI, per-case injection
+and `agentSkillEnabled` (step 6) shipped in **1.14.1** and were republished with fixes in
+**1.14.2**. Steps 1 to 5 were multi-round verified on 2026-08-08, step 6 on 2026-08-09;
+see [§7 Build log](#7-build-log-what-actually-happened) for what shipped, what each
+verification round found, and the two items that genuinely remain open (§2.4's footgun
+guard and the Part 3 deferrals).
 
 **Date**: 2026-08-08
 **Scope**: Part 1 (agent skill) and Part 2 (wait primitives) were specified and built.
@@ -68,6 +70,11 @@ Codeman that is a packaging problem plus one missing primitive, not an architect
 **Conclusion**: roughly 90% of the capability surface already exists. Parts 1 and 2 below close
 the two real gaps.
 
+The table is the 2026-08-08 snapshot that motivated the work, kept as written. The three rows
+marked missing are closed since: `GET .../wait` and `GET .../wait-output` shipped in 1.13.0, and
+the skill is packaged at `skills/codeman` (npm tarball included). `blocked` as a wire-contract
+state, and the machine-readable schema, are still open (Parts 3 and 4).
+
 ---
 
 ## 2. Part 1: the Codeman agent skill
@@ -525,8 +532,8 @@ Bundled manifests plus local override only, no network.
 | 4 ✅ | `wait` field on `POST .../input`, non-wait path proven unchanged                | 16 route tests green; live-verified (no-wait returns in 26ms with the historical bare body; an idle session did NOT satisfy a `wait` request, blocking the full 2001ms, which is the race the endpoint exists to close; the stop hook resolved a send-and-wait at 1510ms and the input was confirmed in the tmux pane; `wait:null` accepted) |
 | 5 ✅ | `skills/codeman/SKILL.md` + reference files + `.claude/skills` symlink          | live dogfood: a real session orchestrates a worker end to end                                                                                                                                                                                                                                                                                |
 | 6 ✅ | `codeman skill install` CLI + `applyAgentSkill()` + `agentSkillEnabled` setting | 10 unit tests (`test/agent-skill.test.ts`) + real-server case-creation tests (`test/quick-start.test.ts`, incl. the settings PUT accepting the key) green; CLI verified live (install/uninstall, global + `--case`, foreign/symlink refusals)                                                                                                 |
-| 7    | Docs: api-reference, extending-codeman, README                                  |                                                                                                                                                                                                                                                                                                                                              |
-| 8    | COM (minor bump: new endpoints, new setting, new optional fields)               | both CI and Release workflows green                                                                                                                                                                                                                                                                                                          |
+| 7 ✅ | Docs: api-reference, extending-codeman, README                                  | plus `architecture-invariants.md` (§agent-wait-primitives), `CLAUDE.md` and the API reference's per-mode signal table                                                                                                                                                                                                                        |
+| 8 ✅ | COM (minor bump: new endpoints, new setting, new optional fields)               | released as 1.13.0 (wait primitives + skill); step 6 followed in 1.14.1 and was republished as 1.14.2 after live-testing the packaged skill                                                                                                                                                                                                  |
 
 Parts 1 and 2 are independent enough to land separately, but the skill is much less useful
 without the wait endpoints, so the wait work goes first.
@@ -541,7 +548,9 @@ without the wait endpoints, so the wait work goes first.
    marker-guarded, so a user-authored copy is never touched.
 4. Is `X-Codeman-Caller-Session` self-protection worth the 10 lines, given it is a footgun guard
    and not a security boundary? (Still open, not built with step 6.)
-5. Regex support in `wait-output`: confirm literal-only for v1.
+5. ✅ Regex support in `wait-output`: literal-only shipped, and a `regex` query param is
+   rejected with a 400 rather than ignored, so an agent that assumed otherwise cannot
+   silently wait on the wrong thing.
 
 ---
 
@@ -654,16 +663,14 @@ success without running its task. Two traps recurred often enough to name:
 
 ### Still open
 
-- **Release checklist**: `package.json` `files` includes `skills`, which is still
-  untracked. `git add skills/` must be part of the release commit, or npm publishes
-  a tarball without the skill (a `files` entry that does not exist is silently
-  ignored, so nothing fails). `test/agent-skill.test.ts` reads the packaged source,
-  so CI at least fails loudly if the directory goes missing from a checkout.
-- The 1.13.0 changeset is written under `.changeset/`; consuming it (COM flow),
-  the release commit, and the deploy remain.
+Both release-checklist items that used to sit here are done: `skills/` is tracked and
+ships through `package.json` `files` (published with 1.13.0, republished with 1.14.2),
+and the changeset was consumed, committed and deployed. What is left:
+
 - Deferred with Part 3: the latched last-signal-per-turn. Nice-to-haves from the
-  reviews: N2 (create the death-watcher inside its `try`) and converting
-  timeout-shaped test detections into fast assertions.
+  reviews: N2 (create the death-watcher inside its `try`, still built one line above
+  it in `GET .../wait`) and converting timeout-shaped test detections into fast
+  assertions.
 - §2.4's `X-Codeman-Caller-Session` footgun guard: still not built (open question 4).
 
 ### Step 6 (2026-08-09): install command, per-case injection, the setting

docs/predictive-echo-plan.md

@@ -0,0 +1,143 @@
+# Predictive write-through echo for codex
+
+Zero-lag local echo for codex sessions via a second, mosh-style mode in the
+`xterm-zerolag-input` package: every keystroke goes to the PTY exactly as the
+1.12.2 overlay-disabled path did (byte-identical wire behavior), while a
+`PredictiveEchoAddon` simultaneously paints the predicted glyph at the predicted
+cell. When the real echo lands, the prediction is confirmed and its span removed
+(invisible swap: identical glyph beneath). Mispredictions drop via a mismatch
+cascade + TTL. Visual-only, self-healing.
+
+## Why this exists
+
+Issues #218/#219/#220/#222 (one root cause) forced 1.12.2 to disable the
+LocalEchoOverlay for codex: buffer-until-Enter starves codex's per-keystroke TUI
+(live slash picker, arrows editing server-side composer state, composer
+rewrap/growth, paste_burst classification). Buffer mode is structurally
+incompatible with codex; write-through prediction is the only echo mode that
+can coexist with it.
+
+## The reconciliation lesson (do not regress this)
+
+`docs/local-echo-overlay-plan.md` ("What NOT to Do") documented that matching
+predictions against the raw output STREAM fails against Ink/TUI full-line
+redraws. This design reads the parsed terminal BUFFER instead (cells after
+xterm's parser ran), which converges to the same cells no matter how the bytes
+arrived. The Phase 0 recordings prove the point twice over: tmux converts
+codex's full-line redraws into minimal in-place deltas (an echo arrives as
+`e\x1b[K\x1b[20;80H...`), and codex itself paints word gaps with ECH+cursor-forward
+instead of spaces. Stream matching can never survive that; buffer diffing does
+not care.
+
+## Phase 0 measurements (codex-cli 0.147.0 via tmux, 100x30, 2026-08-09)
+
+Recorded with `scripts/dev/record-codex-frames.mjs` (production pipeline:
+codex inside tmux `status off`, chunks passed through the same full strip
+`session.ts _handleTerminalOutput()` applies to codex mode). Fixtures in
+`packages/xterm-zerolag-input/test/fixtures/codex/`; replay/measure with
+`scripts/dev/analyze-codex-frames.mjs <fixture>`.
+
+| Question              | Measured answer                                                                                                                                                              |
+| --------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
+| Composer signature    | Cursor row starts `"› "` (U+203A + space), text begins col 2. Present when empty (placeholder), while typing, and while the slash picker filters. `CODEX_COMPOSER_ROW_RE = /^› /` |
+| Composer text color   | Plain default foreground, zero SGR around echoed chars. Span `foregroundColor` default (theme fg) is an exact match                                                            |
+| Placeholder           | Cycling hint text ("Use /skills...", "Improve documentation in @filename", ...) rendered AT the cursor cell. First prediction lands over placeholder glyphs: covered by the snapshot + cursor-advance rules |
+| Wrap                  | Word-wrap near `cols - 2`; continuation rows are indented 2 spaces WITHOUT `› `. The gate therefore suppresses predictions on wrapped lines: deliberate fallback to real echo, wrap was the #220 ghost zone. `edgeMarginCells = 4` |
+| Modal (trust dialog)  | Cursor parks on `"  Press enter to continue"`: no `› ` prefix, gate false, zero predictions painted while keystrokes still reach the PTY (the ghost eliminator)                 |
+| Streaming             | Error/reconnect bursts render above a re-rendered composer that keeps the `› ` signature; end-of-frame cursor parks at the insertion point (col 2 of the composer row). Confirms the cursor-advance confirm rule and the no-drop-on-baseY rule |
+| Echo shape under tmux | tmux emits minimal deltas for simple echoes and full repaints for busy frames; both converge in the parsed buffer                                                              |
+| Slash picker          | Picker rows render below; the cursor row keeps the composer signature and advances per filter char, so predictions stay active while filtering (#222 surface)                 |
+
+Constants decided at the Phase 0 gate: `CODEX_COMPOSER_ROW_RE = /^› /`,
+`ttlMs = 1000`, `maxPending = 32`, `cursorGraceMs = 150`, `edgeMarginCells = 4`,
+span colors = theme defaults, `underlinePredictions = false`.
+
+## Algorithm
+
+See `PredictiveEchoAddon` in
+`packages/xterm-zerolag-input/src/predictive-echo-addon.ts`. Summary of the
+rules and why each exists:
+
+- **State**: ordered `PredictionRecord[]` (`seq`, `char`, `width`, cumulative
+  `offsetCells`, `snapshot` of the cell at predict time, `sentAt`,
+  `mismatches`), plus a run `_anchor {row, col}` captured when the outstanding
+  count goes 0 -> 1. Positions are FIXED at predict time; confirmation deletes
+  spans and never re-lays-out, so partial confirmation causes zero jitter.
+- **predictChar(ch)** runs an inline reconcile first and re-anchors whenever
+  outstanding drains to zero (absorbs the echo-landed-between-keystrokes race).
+  Guards: dims present, cursor numbers present, `viewportY === baseY`,
+  `predictWhen` gate, single codepoint >= 0x20 (not 0x7f), width <= 2,
+  `maxPending`, edge margin. Returns false = suppressed; the consumer sends the
+  keystroke regardless.
+- **Coordinate base is `baseY`**: xterm's `cursorY` is baseY-relative, so
+  absolute buffer line = `baseY + row`. `viewportY` would only coincide while
+  the scrolled-to-bottom guards hold; the addon never relies on that.
+- **reconcile()** (debounced `onWriteParsed` microtask, inline in predictChar,
+  TTL timer): clears everything when scrolled up; off-anchor-row cursor
+  tolerated for `cursorGraceMs` then clears; PREFIX-ONLY confirm loop requiring
+  cell match AND cursor advanced past the record (prevents false confirms
+  against placeholder glyphs and makes identical in-place tmux repaints a
+  no-op); TWO-PASS mismatch rule (a cell that is neither snapshot nor predicted
+  char must persist across two passes before cascading the drop: a half-parsed
+  row on pass N is fully redrawn a few ms later); TTL drop of the stale suffix.
+- **No drop on baseY change**: codex streams push lines to history while the
+  composer stays viewport-pinned; predictions are row-relative to the pinned
+  composer and remain valid (measured above).
+- **Anchor hold** (added by the independent post-build review): after any wire
+  input whose cursor effect the display has not shown yet (backspace with
+  nothing outstanding = deleting echoed text, every 'clear'-classified input,
+  an IME/plain-paste 'text' commit, and the bypass send paths), new
+  predictions are suppressed until the next PARSED write. Anchoring on the
+  stale cursor painted ghosts one cell off ("tehh" on backspace-then-retype
+  within RTT), blank-neutral and therefore TTL-lived. Worst case is exactly
+  one unpredicted keystroke: its own echo is a write, which releases the hold.
+- **predictBackspace()** pops the newest outstanding record (informational
+  return; the consumer forwards `\x7f` unconditionally). Deleting already-echoed
+  text renders at RTT in v1.
+- **CJK/wide**: 2-cell spans, stacking by cumulative visual width, leading-cell
+  confirm. In Codeman, IME input never reaches the hook (`window.cjkActive`
+  returns from onData first); package support exists for other consumers.
+
+## Integration map (Codeman)
+
+- Policy: `_localEchoPolicy` (`'buffer' | 'predict' | 'off'`) computed at the
+  end of `_updateLocalEchoState()`; codex + `localEchoEnabled` -> `'predict'`
+  while `_localEchoEnabled` stays false (every 1.12.2 consumer unchanged).
+- onData hook sits between the buffer block and Normal Mode, classifies via
+  `classifyPredictInput()` (pure, on `window.CodemanTerminalInput`), never
+  returns, try/catch-wrapped: the wire path below is byte-identical with the
+  predictor active, absent, or throwing.
+- Composer gate: `isCodexComposerRow()` set via `setPredictWhen()` at
+  construction (the vendor footer stays package-agnostic).
+- Second vendor bundle `vendor/xterm-predictive-echo.js` (postinstall + build);
+  the zerolag bundle build command is untouched and its output byte-identical.
+  Missing/broken bundle = plain 1.12.2 echo (`typeof PredictiveEchoOverlay ===
+  'undefined'` guard).
+- Prediction clears on: tab switch, SSE reconnect init, `insertTerminalText`,
+  `clearTerminalInput`, voice send, keyboard-accessory `sendKey`, resize, skin
+  and font changes re-read style via `refreshFont()`.
+
+## Risk register
+
+Eliminated structurally: other-mode regression (zero edits to buffer
+addon/branches, byte-identical existing bundle, policy-matrix + byte-identity
+tests); bundle breakage (separate bundle, graceful degradation); wire
+corruption (no-return fall-through + try/catch + byte-identity pins at vm and
+E2E level); modal ghosts (measured predictWhen gate); false confirms
+(cursor-advance rule); mid-parse flicker drops (two-pass rule); wrap
+misplacement (edge margin + continuation-row gate fallback + off-row grace).
+
+Accepted residuals (visual-only, self-healing <= ttlMs, kill-switchable via
+`localEchoEnabled` per device): no predictions on wrapped continuation lines
+(gate false there, deliberate); brief dropout during composer growth; DOM-span
+vs WebGL glyph rendering can differ subtly (same trade-off as the buffer
+overlay, same font recipe); typing during an unsynchronized half-frame can
+mis-anchor one run (mismatch/TTL cleans within 1s).
+
+## Future work
+
+RTT-adaptive TTL; mosh-style confidence gating (paint only after the link
+proves laggy); predicted backspace into echoed text; predict mode for shell
+prompts; unifying the small font/container duplication between the two addons
+once predict mode has proven out; continuation-line prediction behind a
+smarter composer-extent detector.

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "aicodeman",
-  "version": "1.14.2",
+  "version": "1.15.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "aicodeman",
-      "version": "1.14.2",
+      "version": "1.15.0",
       "hasInstallScript": true,
       "license": "MIT",
       "workspaces": [
@@ -4547,6 +4547,16 @@
       "integrity": "sha512-b3fMOsyLVuCeNJWxolACEUED0vm7qC0cy4wRvf3oURSzDTYVQiGPhTnhWZwIHdvC48Y+oLhvYXnY4XDXPoJo6A==",
       "license": "MIT"
     },
+    "node_modules/@xterm/headless": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/@xterm/headless/-/headless-6.0.0.tgz",
+      "integrity": "sha512-5Yj1QINYCyzrZtf8OFIHi47iQtI+0qYFPHmouEfG8dHNxbZ9Tb9YGSuLcsEwj9Z+OL75GJqPyJbyoFer80a2Hw==",
+      "dev": true,
+      "license": "MIT",
+      "workspaces": [
+        "addons/*"
+      ]
+    },
     "node_modules/@xterm/xterm": {
       "version": "6.0.0",
       "resolved": "https://registry.npmjs.org/@xterm/xterm/-/xterm-6.0.0.tgz",
@@ -12333,9 +12343,10 @@
       }
     },
     "packages/xterm-zerolag-input": {
-      "version": "0.1.8",
+      "version": "0.3.0",
       "license": "MIT",
       "devDependencies": {
+        "@xterm/headless": "^6.0.0",
         "jsdom": "^24.1.3",
         "tsup": "^8.5.1",
         "typescript": "^5.5.0",

package.json

@@ -1,6 +1,6 @@
 {
   "name": "aicodeman",
-  "version": "1.14.2",
+  "version": "1.15.0",
   "description": "Mission control for AI coding agents - run 20 autonomous agents with real-time monitoring and session persistence",
   "type": "module",
   "main": "dist/index.js",
@@ -21,6 +21,8 @@
     "test:watch": "vitest --config config/vitest.config.ts",
     "test:coverage": "vitest run --config config/vitest.config.ts --coverage",
     "test:ci": "vitest run --config config/vitest.ci.config.ts",
+    "pretest:mobile": "node scripts/prepare-test-vendor.mjs",
+    "test:mobile": "vitest run --config test/mobile/vitest.config.ts",
     "check:frontend-syntax": "node scripts/check-frontend-syntax.mjs",
     "fix:node-pty": "node scripts/fix-node-pty.mjs",
     "typecheck": "tsc --noEmit",

packages/xterm-zerolag-input/CHANGELOG.md

@@ -1,5 +1,30 @@
 # xterm-zerolag-input
 
+## 0.3.0
+
+### Minor Changes
+
+- 55bff4a: Zero-lag predictive echo for Codex sessions (mosh-style write-through prediction).
+
+  Codex's per-keystroke composer forced 1.12.2 to disable the local-echo overlay (issues #218/#219/#220/#222), leaving Codex typing at full round-trip latency on remote links. This release adds a second echo mode instead of re-enabling the first: every keystroke still goes to the PTY exactly as before (byte-identical wire behavior, pinned by vm-level and end-to-end trace-equality tests), while the new `PredictiveEchoAddon` in `xterm-zerolag-input` 0.2.0 paints the predicted glyph at the predicted cell. When the real echo lands, the prediction is confirmed and its span removed (an invisible swap); mispredictions self-heal via a two-pass mismatch cascade and a TTL.
+  - Reconciliation reads the parsed terminal buffer, never the raw stream: full-line redraws, ECH gap painting and tmux's in-place deltas all converge to the same cells. Confirmation requires the cell match PLUS a cursor advance, so placeholder glyphs and identical repaints never false-confirm; blank cells are neutral (codex clears its placeholder on the first echo).
+  - Predictions paint only while the cursor sits on the measured Codex composer row (`/^› /`, codex-cli 0.147): trust/approval modals and wrapped continuation rows get no ghosts, deliberately falling back to real echo.
+  - Ships as a SEPARATE `vendor/xterm-predictive-echo.js` bundle: the existing zerolag bundle is byte-identical (sha256-verified), and a missing or broken bundle degrades Codex to exact 1.12.2 behavior. The per-device `localEchoEnabled` toggle is the kill switch.
+  - Claude/Gemini/OpenCode/Antigravity keep buffer mode untouched; shell stays off.
+  - A post-build adversarial review added the anchor-hold rule: after an unpredicted wire edit (backspace into echoed text, cleared input, IME text commits) new predictions hold until the next parsed write, so a stale displayed cursor can never mis-anchor a run.
+  - Tests: 55 new package tests including replay suites driven by fixtures recorded from a real codex TUI through the production tmux+strip pipeline (`scripts/dev/record-codex-frames.mjs`) and a 500-iteration seeded fuzz; new vm policy/wire-neutrality suites; a 10-scenario Playwright E2E against real codex covering the #218/#219/#220/#222 retests, byte-identity, and a simulated 300ms-RTT run. The package test suite now runs in CI.
+
+## 0.2.0
+
+### Minor Changes
+
+- **New addon: `PredictiveEchoAddon`, mosh-style write-through prediction.** The second echo mode for per-keystroke TUIs (OpenAI Codex's composer, live pickers) that buffer-until-Enter starves. Every keystroke is sent by the consumer immediately and unchanged; the addon paints the predicted glyph at the predicted cell and reconciles against the PARSED terminal buffer: confirmation requires the cell match plus a cursor advance past the record, foreign non-blank content on two consecutive passes cascades a drop, blank cells are neutral, a TTL bounds everything, and scroll/resize/sustained cursor moves clear the run. Visual-only by construction; it cannot gate, delay or rewrite input.
+  - Anchor-hold rule: after an unpredicted wire edit (backspace into echoed text, cleared input, an IME text commit) new predictions hold until the next parsed write, so a stale displayed cursor can never mis-anchor a run (worst case: exactly one unpredicted keystroke).
+  - New exports: `PredictiveEchoAddon`, `PredictiveEchoOptions`, `PredictionState`, plus the long-intended `charCellWidth` / `stringCellWidth` helpers.
+  - `XtermTerminal` type gains OPTIONAL members (`buffer.active.cursorX/cursorY`, `getLine().getCell?`, `onWriteParsed?`, `onResize?`). Additive only: existing consumers and mocks are unaffected.
+  - IIFE build exposes `window.PredictiveEchoAddon` and a self-activating `window.PredictiveEchoOverlay`, alongside the unchanged `ZerolagInputAddon` / `LocalEchoOverlay` globals.
+  - Tests: 52 new (30 addon-law specs, renderer geometry, 6 replay suites driven by fixtures recorded from real codex 0.147 through tmux + the production strip, and a 500-iteration seeded fuzz with per-op invariants). `@xterm/headless` as a devDependency; runtime dependencies remain zero.
+
 ## 0.1.8
 
 ### Patch Changes

packages/xterm-zerolag-input/README.md

@@ -9,7 +9,7 @@
     <a href="https://opensource.org/licenses/MIT"><img src="https://img.shields.io/badge/License-MIT-1e3a5f?style=flat-square" alt="MIT"></a>
     <img src="https://img.shields.io/badge/Dependencies-0-22c55e?style=flat-square" alt="Zero dependencies">
     <img src="https://img.shields.io/badge/Size-6.1%20kB%20gzip-22c55e?style=flat-square" alt="6.1 kB gzipped">
-    <img src="https://img.shields.io/badge/Tests-175-22c55e?style=flat-square" alt="175 tests">
+    <img src="https://img.shields.io/badge/Tests-227-22c55e?style=flat-square" alt="175 tests">
     <img src="https://img.shields.io/badge/xterm.js-v5%20%7C%20v7+-3b82f6?style=flat-square" alt="xterm.js v5 and v7+">
   </p>
 </p>
@@ -46,6 +46,15 @@ Same keystroke, same link. The only difference is who you wait for: the server,
 
 **No backend changes. No protocol. No server support.** It is a client-side addon that never touches the wire.
 
+Since 0.2.0 the package ships **two addons for two kinds of TUIs**:
+
+| Addon                 | Model                                                          | Use when                                                                                                              |
+| --------------------- | -------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------- |
+| `ZerolagInputAddon`   | **Buffer**: hold keystrokes locally, flush on Enter            | The remote side is a line-oriented prompt (shells, REPLs, Claude Code's composer) that only needs the finished line     |
+| `PredictiveEchoAddon` | **Predictive write-through**: send every keystroke immediately, paint a prediction, confirm against the parsed buffer | The remote side is a per-keystroke TUI (OpenAI Codex's composer, live pickers) that buffering would starve              |
+
+`ZerolagInputAddon` is documented below; jump to [PredictiveEchoAddon](#predictiveechoaddon-write-through-prediction) for the second mode.
+
 ## Why this one
 
 | | |
@@ -268,6 +277,110 @@ Finds text that exists after the prompt but was never typed through the overlay.
 
 ---
 
+## `PredictiveEchoAddon` (write-through prediction)
+
+Buffering is the wrong model for TUIs that react to every keystroke: a slash
+command picker filters live, arrows edit server-side state, the composer
+rewraps as it grows. For those, `PredictiveEchoAddon` works like
+[mosh](https://mosh.org/): the keystroke goes to the PTY **immediately and
+unchanged**, and the addon simultaneously paints the predicted glyph at the
+predicted cell. When the real echo lands, the prediction is confirmed and its
+span removed: an invisible swap, identical glyph beneath. Mispredictions
+self-heal via a mismatch cascade and a TTL. It is visual-only by construction:
+nothing it does can gate, delay, reorder or rewrite what you send.
+
+```typescript
+import { Terminal } from '@xterm/xterm';
+import { PredictiveEchoAddon } from 'xterm-zerolag-input';
+
+const terminal = new Terminal();
+const predictor = new PredictiveEchoAddon({
+  // Optional: only predict when the cursor sits on a composer row
+  predictWhen: (t) => {
+    const buf = t.buffer.active;
+    const line = buf.getLine(buf.baseY + buf.cursorY);
+    return !!line && /^› /.test(line.translateToString(true));
+  },
+});
+terminal.loadAddon(predictor);
+
+terminal.onData((data) => {
+  const cps = Array.from(data);
+  if (cps.length === 1) {
+    const cp = cps[0].codePointAt(0);
+    if (cp === 0x7f) predictor.predictBackspace();
+    else if (cp >= 0x20) predictor.predictChar(data);
+    else predictor.clearPredictions();          // Enter, Ctrl+C, ...
+  } else if (data.charCodeAt(0) === 0x1b) {
+    predictor.clearPredictions();               // nav keys, bracketed paste
+  }
+  pty.write(data);                              // ALWAYS, unconditionally
+});
+```
+
+### How reconciliation works
+
+Predictions are reconciled against the **parsed terminal buffer** (cells after
+xterm's parser ran), never the raw output stream. That distinction is
+load-bearing: TUIs redraw whole lines, paint gaps with `ECH` + cursor-forward
+instead of spaces, and multiplexers like tmux rewrite everything into minimal
+deltas. Stream matching breaks on all of that; buffer cells converge to the
+same values no matter how the bytes arrived.
+
+A prediction is **confirmed** only when its cell shows the predicted glyph AND
+the cursor has advanced past it (so a placeholder that happens to match, or an
+identical in-place repaint, never false-confirms). A cell showing foreign
+non-blank content on two consecutive passes drops that prediction and all
+later ones (one pass tolerates half-parsed frames). Blank cells are neutral:
+they are what "not yet echoed" looks like. Whatever remains is dropped by TTL.
+Scrolling up, resizing, or a sustained cursor move clears the run. After a
+backspace into already-echoed text, a cleared input, or a multi-char commit,
+the addon **holds** new predictions until the next parsed write: the displayed
+cursor is stale for one round trip, and anchoring on it would paint ghosts one
+cell off (worst case: exactly one unpredicted keystroke, whose own echo
+releases the hold).
+
+### API
+
+```typescript
+predictChar(ch: string): boolean;     // false = suppressed (still SEND the key)
+predictBackspace(): boolean;          // pops the newest prediction (still send \x7f)
+clearPredictions(): void;
+reconcile(): void;                    // manual pass (no onWriteParsed available)
+setPredictWhen(fn | null): void;      // swap the gate at runtime
+refreshFont(): void;                  // after font/theme changes
+get hasPredictions(): boolean;
+get state(): PredictionState;         // { outstanding, confirmedTotal, droppedTotal, anchor }
+```
+
+### Options
+
+```typescript
+{
+  zIndex?: number,                // Default: 7
+  underlinePredictions?: boolean, // Default: false (underline unconfirmed glyphs)
+  foregroundColor?: string,       // Default: terminal theme / computed .xterm-rows style
+  backgroundColor?: string,       // Default: terminal theme background
+  ttlMs?: number,                 // Default: 1000
+  maxPending?: number,            // Default: 32
+  cursorGraceMs?: number,         // Default: 150
+  edgeMarginCells?: number,       // Default: 4 (suppress near the right edge)
+  predictWhen?: (t) => boolean,   // Default: predict everywhere
+}
+```
+
+### Which addon should I use?
+
+- The remote program shows a **line prompt** and ignores partial input:
+  `ZerolagInputAddon`. You also get backspace-before-send and batching.
+- The remote program **reacts per keystroke** (pickers, filters, composers
+  that rewrap): `PredictiveEchoAddon`. It never withholds bytes, so the TUI
+  behaves exactly as with no addon at all; you just stop waiting for the RTT.
+- Both can be loaded on one terminal and toggled per session mode; that is
+  exactly what Codeman does (buffer for Claude Code, predict for Codex).
+
+---
+
 ## Integration patterns
 
 ### Buffered input (hold until Enter)

packages/xterm-zerolag-input/package.json

@@ -1,6 +1,6 @@
 {
   "name": "xterm-zerolag-input",
-  "version": "0.1.8",
+  "version": "0.3.0",
   "description": "Instant keystroke feedback overlay for xterm.js: Mosh-inspired local echo that removes perceived input latency over SSH, tunnels and other high-RTT connections",
   "type": "module",
   "main": "dist/index.cjs",
@@ -37,7 +37,9 @@
     "ssh",
     "remote-terminal",
     "overlay",
-    "addon"
+    "addon",
+    "predictive",
+    "write-through"
   ],
   "license": "MIT",
   "homepage": "https://github.com/Ark0N/Codeman/tree/master/packages/xterm-zerolag-input#readme",
@@ -50,6 +52,7 @@
     "directory": "packages/xterm-zerolag-input"
   },
   "devDependencies": {
+    "@xterm/headless": "^6.0.0",
     "jsdom": "^24.1.3",
     "tsup": "^8.5.1",
     "typescript": "^5.5.0",

packages/xterm-zerolag-input/src/cell-dimensions.ts

@@ -11,37 +11,36 @@ import type { XtermTerminal, CellDimensions } from './types.js';
  * unavailable.
  */
 export function getCellDimensions(terminal: XtermTerminal): CellDimensions | null {
-    // eslint-disable-next-line @typescript-eslint/no-explicit-any
-    const t = terminal as any;
-    const dpr = typeof devicePixelRatio === 'number' && devicePixelRatio > 0
-        ? devicePixelRatio : 1;
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  const t = terminal as any;
+  const dpr = typeof devicePixelRatio === 'number' && devicePixelRatio > 0 ? devicePixelRatio : 1;
 
-    // Try v7+ public API first
-    if (t.dimensions?.css?.cell) {
-        const cellH = t.dimensions.css.cell.height;
-        return {
-            width: t.dimensions.css.cell.width,
-            height: cellH,
-            charTop: (t.dimensions?.device?.char?.top ?? 0) / dpr,
-            charHeight: (t.dimensions?.device?.char?.height ?? (cellH * dpr)) / dpr,
-        };
+  // Try v7+ public API first
+  if (t.dimensions?.css?.cell) {
+    const cellH = t.dimensions.css.cell.height;
+    return {
+      width: t.dimensions.css.cell.width,
+      height: cellH,
+      charTop: (t.dimensions?.device?.char?.top ?? 0) / dpr,
+      charHeight: (t.dimensions?.device?.char?.height ?? cellH * dpr) / dpr,
+    };
+  }
+
+  // Fall back to v5 private API
+  try {
+    const dims = t._core?._renderService?.dimensions;
+    if (dims?.css?.cell) {
+      const cellH = dims.css.cell.height;
+      return {
+        width: dims.css.cell.width,
+        height: cellH,
+        charTop: (dims.device?.char?.top ?? 0) / dpr,
+        charHeight: (dims.device?.char?.height ?? cellH * dpr) / dpr,
+      };
     }
+  } catch {
+    // Private API may throw in some environments
+  }
 
-    // Fall back to v5 private API
-    try {
-        const dims = t._core?._renderService?.dimensions;
-        if (dims?.css?.cell) {
-            const cellH = dims.css.cell.height;
-            return {
-                width: dims.css.cell.width,
-                height: cellH,
-                charTop: (dims.device?.char?.top ?? 0) / dpr,
-                charHeight: (dims.device?.char?.height ?? (cellH * dpr)) / dpr,
-            };
-        }
-    } catch {
-        // Private API may throw in some environments
-    }
-
-    return null;
+  return null;
 }

packages/xterm-zerolag-input/src/index.ts

@@ -1,10 +1,13 @@
 export { ZerolagInputAddon } from './zerolag-input-addon.js';
+export { PredictiveEchoAddon } from './predictive-echo-addon.js';
+export { charCellWidth, stringCellWidth } from './overlay-renderer.js';
 export type {
-    XtermTerminal,
-    XtermAddon,
-    ZerolagInputOptions,
-    ZerolagInputState,
-    PromptFinder,
-    PromptPosition,
-    CellDimensions,
+  XtermTerminal,
+  XtermAddon,
+  ZerolagInputOptions,
+  ZerolagInputState,
+  PromptFinder,
+  PromptPosition,
+  CellDimensions,
 } from './types.js';
+export type { PredictiveEchoOptions, PredictionState } from './predictive-echo-addon.js';

packages/xterm-zerolag-input/src/prediction-renderer.ts

@@ -0,0 +1,59 @@
+/**
+ * Incremental DOM renderer for PredictiveEchoAddon.
+ *
+ * Unlike overlay-renderer.ts (which paints whole lines with an opaque
+ * background out to totalCols), prediction spans cover ONLY the predicted
+ * glyph's own cells: anything wider would blank real echo arriving around
+ * a prediction. Spans are keyed by prediction seq for O(1) removal.
+ */
+import type { CellDimensions, FontStyle } from './types.js';
+
+export interface PredictionSpanParams {
+  seq: number;
+  /** Viewport-relative row (0-based). */
+  row: number;
+  /** Column (0-based). */
+  col: number;
+  char: string;
+  /** Cell width of the glyph (1 or 2). */
+  width: 1 | 2;
+  dims: CellDimensions;
+  font: FontStyle;
+  underline: boolean;
+}
+
+export function addPredictionSpan(
+  container: HTMLElement,
+  map: Map<number, HTMLSpanElement>,
+  p: PredictionSpanParams
+): void {
+  const span = document.createElement('span');
+  // cellH+1 height: covers the sub-pixel seam between rows (same trick the
+  // buffer overlay renderer ships with). Background covers only this glyph's
+  // cells, never a full row.
+  span.style.cssText =
+    `position:absolute;left:${p.col * p.dims.width}px;top:${p.row * p.dims.height}px;` +
+    `width:${p.width * p.dims.width}px;height:${p.dims.height + 1}px;line-height:${p.dims.height}px;` +
+    `text-align:center;pointer-events:none;` +
+    `font-family:${p.font.fontFamily};font-size:${p.font.fontSize};font-weight:${p.font.fontWeight};` +
+    (p.font.letterSpacing ? `letter-spacing:${p.font.letterSpacing};` : '') +
+    `color:${p.font.color};background-color:${p.font.backgroundColor};` +
+    `font-feature-settings:'liga' 0,'calt' 0;` +
+    (p.underline ? 'text-decoration:underline;' : '');
+  span.textContent = p.char;
+  map.set(p.seq, span);
+  container.appendChild(span);
+}
+
+export function removePredictionSpan(map: Map<number, HTMLSpanElement>, seq: number): void {
+  const span = map.get(seq);
+  if (span) {
+    span.remove();
+    map.delete(seq);
+  }
+}
+
+export function clearAllSpans(map: Map<number, HTMLSpanElement>): void {
+  for (const span of map.values()) span.remove();
+  map.clear();
+}

packages/xterm-zerolag-input/src/predictive-echo-addon.ts

@@ -0,0 +1,480 @@
+/**
+ * PredictiveEchoAddon: mosh-style write-through local echo.
+ *
+ * The consumer sends every keystroke to the PTY unchanged (write-through);
+ * this addon simultaneously paints the predicted glyph at the predicted cell.
+ * When the real echo lands, the prediction is confirmed and its span removed
+ * (an invisible swap: identical glyph beneath). Mispredictions self-heal via
+ * a mismatch cascade and a TTL. Everything here is visual-only: no method
+ * gates, delays, or rewrites what the consumer sends.
+ *
+ * Reconciliation reads the parsed terminal BUFFER (cells after xterm's parser
+ * ran), never the raw output stream. Full-line redraws, ECH-based gap
+ * painting, and tmux's in-place deltas all converge to the same cells; stream
+ * matching cannot survive them (see docs/local-echo-overlay-plan.md's
+ * "What NOT to Do" in the consuming repo).
+ *
+ * Coordinate base: xterm's `cursorY` is relative to `baseY`, so the absolute
+ * buffer line for a viewport row is `baseY + row`. `viewportY` would only
+ * coincide while scrolled to the bottom; this file never relies on that.
+ */
+import { getCellDimensions } from './cell-dimensions.js';
+import { charCellWidth } from './overlay-renderer.js';
+import { addPredictionSpan, clearAllSpans, removePredictionSpan } from './prediction-renderer.js';
+import type { FontStyle, XtermAddon, XtermTerminal } from './types.js';
+
+export interface PredictiveEchoOptions {
+  /** Z-index of the span container. @default 7 (same layer as the buffer overlay) */
+  zIndex?: number;
+  /** Render predicted glyphs underlined (visual hedge on unreliable links). @default false */
+  underlinePredictions?: boolean;
+  /** Predicted glyph color. @default theme foreground / computed .xterm-rows color */
+  foregroundColor?: string;
+  /** Predicted glyph background. @default theme background */
+  backgroundColor?: string;
+  /** Drop predictions older than this. @default 1000 */
+  ttlMs?: number;
+  /** Maximum outstanding predictions per run. @default 32 */
+  maxPending?: number;
+  /** How long the cursor may sit off the anchor row before predictions clear. @default 150 */
+  cursorGraceMs?: number;
+  /** Suppress predictions that would land within this many cells of the right edge. @default 4 */
+  edgeMarginCells?: number;
+  /** Gate: return false to suppress prediction (e.g. cursor not on a composer row). */
+  predictWhen?: (terminal: XtermTerminal) => boolean;
+}
+
+export interface PredictionState {
+  outstanding: number;
+  confirmedTotal: number;
+  droppedTotal: number;
+  anchor: { row: number; col: number } | null;
+}
+
+interface PredictionRecord {
+  seq: number;
+  char: string;
+  /** Cells this glyph occupies. */
+  width: 1 | 2;
+  /** Cumulative cell offset from the anchor column BEFORE this char. */
+  offsetCells: number;
+  /** Cell content at predict time, '' normalized to ' '. */
+  snapshot: string;
+  sentAt: number;
+  /** Consecutive reconcile passes that saw foreign non-blank content. */
+  mismatches: number;
+}
+
+const DEFAULT_OPTIONS = {
+  zIndex: 7,
+  underlinePredictions: false,
+  ttlMs: 1000,
+  maxPending: 32,
+  cursorGraceMs: 150,
+  edgeMarginCells: 4,
+} as const;
+
+const DEFAULT_BG = '#000000';
+const DEFAULT_FG = '#ffffff';
+
+export class PredictiveEchoAddon implements XtermAddon {
+  private _terminal: XtermTerminal | null = null;
+  private _container: HTMLDivElement | null = null;
+  private _spans = new Map<number, HTMLSpanElement>();
+  private _outstanding: PredictionRecord[] = [];
+  private _anchor: { row: number; col: number } | null = null;
+  private _cursorOffRowSince: number | null = null;
+  private _seq = 0;
+  private _confirmedTotal = 0;
+  private _droppedTotal = 0;
+  private _ttlTimer: ReturnType<typeof setTimeout> | null = null;
+  /** Anchor hold: set after an unpredicted wire edit (backspace into echoed
+   *  text, any cleared input, an IME text commit). While held, new
+   *  predictions are suppressed: the displayed cursor is stale until the
+   *  next parsed write, and anchoring on it paints ghosts one cell off
+   *  (found by review: backspace-then-retype within RTT). Cleared by the
+   *  onWriteParsed pass and by public reconcile(), never by the inline
+   *  predictChar pass (which runs before the display could catch up). */
+  private _anchorHold = false;
+  private _reconcileScheduled = false;
+  private _disposables: Array<{ dispose(): void }> = [];
+  private _predictWhen: ((terminal: XtermTerminal) => boolean) | null;
+  private _options: Required<Omit<PredictiveEchoOptions, 'foregroundColor' | 'backgroundColor' | 'predictWhen'>> &
+    Pick<PredictiveEchoOptions, 'foregroundColor' | 'backgroundColor'>;
+  private _font: FontStyle = {
+    fontFamily: 'monospace',
+    fontSize: '14px',
+    fontWeight: 'normal',
+    color: DEFAULT_FG,
+    backgroundColor: DEFAULT_BG,
+    letterSpacing: '',
+  };
+
+  constructor(options?: PredictiveEchoOptions) {
+    this._options = {
+      zIndex: options?.zIndex ?? DEFAULT_OPTIONS.zIndex,
+      underlinePredictions: options?.underlinePredictions ?? DEFAULT_OPTIONS.underlinePredictions,
+      ttlMs: options?.ttlMs ?? DEFAULT_OPTIONS.ttlMs,
+      maxPending: options?.maxPending ?? DEFAULT_OPTIONS.maxPending,
+      cursorGraceMs: options?.cursorGraceMs ?? DEFAULT_OPTIONS.cursorGraceMs,
+      edgeMarginCells: options?.edgeMarginCells ?? DEFAULT_OPTIONS.edgeMarginCells,
+      foregroundColor: options?.foregroundColor,
+      backgroundColor: options?.backgroundColor,
+    };
+    this._predictWhen = options?.predictWhen ?? null;
+  }
+
+  // ─── Lifecycle ────────────────────────────────────────────────────
+
+  /** Called by `terminal.loadAddon()`. Do not call directly. */
+  activate(terminal: XtermTerminal): void {
+    this._terminal = terminal;
+
+    this._container = document.createElement('div');
+    this._container.setAttribute('data-predictive-echo', '');
+    this._container.style.cssText = `position:absolute;left:0;top:0;z-index:${this._options.zIndex};pointer-events:none`;
+    const screen = terminal.element?.querySelector('.xterm-screen');
+    if (screen) screen.appendChild(this._container);
+
+    this._readFontStyle();
+
+    // Debounced post-parse reconcile: xterm fires onWriteParsed after the
+    // parser finishes a write chunk, so buffer reads see consistent state.
+    // The microtask coalesces multi-chunk bursts into one pass.
+    if (typeof terminal.onWriteParsed === 'function') {
+      try {
+        this._disposables.push(
+          terminal.onWriteParsed(() => {
+            if (this._reconcileScheduled) return;
+            this._reconcileScheduled = true;
+            queueMicrotask(() => {
+              this._reconcileScheduled = false;
+              this._anchorHold = false; // a parse pass ran: the display caught up
+              this._safeReconcile();
+            });
+          })
+        );
+      } catch {
+        /* consumers without a working emitter fall back to manual reconcile() */
+      }
+    }
+    if (typeof terminal.onResize === 'function') {
+      try {
+        this._disposables.push(terminal.onResize(() => this.clearPredictions()));
+      } catch {
+        /* ignore */
+      }
+    }
+  }
+
+  dispose(): void {
+    this.clearPredictions();
+    for (const d of this._disposables) {
+      try {
+        d.dispose();
+      } catch {
+        /* ignore */
+      }
+    }
+    this._disposables = [];
+    this._container?.remove();
+    this._container = null;
+    this._terminal = null;
+  }
+
+  // ─── Public API ───────────────────────────────────────────────────
+
+  /**
+   * Predict a single typed character at the current insertion point.
+   * Returns false when suppressed; the consumer sends the keystroke to the
+   * PTY either way (the return value is informational, never a send gate).
+   */
+  predictChar(ch: string): boolean {
+    try {
+      this._reconcile();
+      if (this._anchorHold) return false; // display has not caught up with a wire edit
+
+      const t = this._terminal;
+      if (!t || !this._container) return false;
+      const dims = getCellDimensions(t);
+      if (!dims) return false;
+      const buf = t.buffer.active;
+      if (typeof buf.cursorX !== 'number' || typeof buf.cursorY !== 'number') return false;
+      if (buf.viewportY !== buf.baseY) return false;
+      if (this._predictWhen && this._predictWhen(t) === false) return false;
+
+      const cps = Array.from(ch);
+      if (cps.length !== 1) return false;
+      const cp = cps[0].codePointAt(0)!;
+      if (cp < 0x20 || cp === 0x7f) return false;
+      const w = charCellWidth(t, cps[0]);
+      if (w !== 1 && w !== 2) return false;
+      if (w === 2 && !this._hasGetCell()) return false; // ASCII fallback misaligns on wide cols
+      if (this._outstanding.length >= this._options.maxPending) return false;
+
+      if (this._outstanding.length === 0) {
+        this._anchor = { row: buf.cursorY, col: buf.cursorX };
+        this._cursorOffRowSince = null;
+      }
+      const anchor = this._anchor!;
+      const last = this._outstanding[this._outstanding.length - 1];
+      const offset = last ? last.offsetCells + last.width : 0;
+      const col = anchor.col + offset;
+      if (col + w > t.cols - this._options.edgeMarginCells) return false;
+
+      const rec: PredictionRecord = {
+        seq: this._seq++,
+        char: cps[0],
+        width: w,
+        offsetCells: offset,
+        snapshot: this._readCell(anchor.row, col),
+        sentAt: performance.now(),
+        mismatches: 0,
+      };
+      this._outstanding.push(rec);
+      addPredictionSpan(this._container, this._spans, {
+        seq: rec.seq,
+        row: anchor.row,
+        col,
+        char: rec.char,
+        width: w,
+        dims,
+        font: this._font,
+        underline: this._options.underlinePredictions,
+      });
+      this._armTtl();
+      return true;
+    } catch {
+      return false;
+    }
+  }
+
+  /**
+   * Pop the newest outstanding prediction (visual only). Returns false when
+   * none are outstanding. The consumer forwards \x7f UNCONDITIONALLY either
+   * way; deleting already-echoed text renders at RTT.
+   */
+  predictBackspace(): boolean {
+    try {
+      const rec = this._outstanding.pop();
+      if (!rec) {
+        // \x7f goes to the wire and will delete ECHOED text: the cursor is
+        // about to move in a way we cannot see yet
+        this._anchorHold = true;
+        return false;
+      }
+      removePredictionSpan(this._spans, rec.seq);
+      if (this._outstanding.length === 0) this._resetRun();
+      return true;
+    } catch {
+      return false;
+    }
+  }
+
+  /** Drop every outstanding prediction and its spans. Also arms the anchor
+   *  hold: consumers clear on inputs (Enter, Esc, arrows, pastes) whose
+   *  cursor effect is unknown until the next parsed write. */
+  clearPredictions(): void {
+    try {
+      this._anchorHold = true;
+      this._droppedTotal += this._outstanding.length;
+      this._outstanding = [];
+      clearAllSpans(this._spans);
+      this._resetRun();
+    } catch {
+      /* ignore */
+    }
+  }
+
+  /** Manual reconcile pass, for consumers without onWriteParsed. By contract
+   *  it is called after writes parsed, so it also releases the anchor hold. */
+  reconcile(): void {
+    this._anchorHold = false;
+    this._safeReconcile();
+  }
+
+  /** Swap the prediction gate at runtime (mirrors the buffer addon's setPrompt). */
+  setPredictWhen(fn: ((terminal: XtermTerminal) => boolean) | null): void {
+    this._predictWhen = fn;
+  }
+
+  /** Re-read font/theme (call after skin or font-size changes). */
+  refreshFont(): void {
+    this._readFontStyle();
+  }
+
+  get hasPredictions(): boolean {
+    return this._outstanding.length > 0;
+  }
+
+  get state(): PredictionState {
+    return {
+      outstanding: this._outstanding.length,
+      confirmedTotal: this._confirmedTotal,
+      droppedTotal: this._droppedTotal,
+      anchor: this._anchor ? { ...this._anchor } : null,
+    };
+  }
+
+  // ─── Reconciliation ───────────────────────────────────────────────
+
+  private _safeReconcile(): void {
+    try {
+      this._reconcile();
+    } catch {
+      /* predictions may degrade, never break input */
+    }
+  }
+
+  private _reconcile(): void {
+    const t = this._terminal;
+    if (!t) return;
+    if (this._outstanding.length === 0) return; // streaming cost: one boolean
+    const buf = t.buffer.active;
+    if (buf.viewportY !== buf.baseY) {
+      this.clearPredictions(); // user scrolled up
+      return;
+    }
+    if (typeof buf.cursorX !== 'number' || typeof buf.cursorY !== 'number') return; // TTL will clean
+    const anchor = this._anchor!;
+    const now = performance.now();
+
+    // Off-row grace: transient cursor excursions (repaints park the cursor
+    // elsewhere mid-frame) are tolerated; a sustained move means the composer
+    // relocated or the user navigated, so predictions are stale.
+    if (buf.cursorY !== anchor.row) {
+      this._cursorOffRowSince ??= now;
+      if (now - this._cursorOffRowSince > this._options.cursorGraceMs) {
+        this.clearPredictions();
+        return;
+      }
+    } else {
+      this._cursorOffRowSince = null;
+    }
+
+    // Confirm loop: PREFIX-ONLY, and only with the cursor advanced past the
+    // record. Cell match alone is not enough: the predicted char may equal
+    // pre-existing content (placeholder glyphs), and an identical in-place
+    // tmux repaint must be a no-op (cells match snapshots, cursor unmoved).
+    while (this._outstanding.length > 0) {
+      const rec = this._outstanding[0];
+      const cell = this._readCell(anchor.row, anchor.col + rec.offsetCells);
+      if (cell === rec.char && buf.cursorY === anchor.row && buf.cursorX >= anchor.col + rec.offsetCells + rec.width) {
+        this._outstanding.shift();
+        removePredictionSpan(this._spans, rec.seq);
+        this._confirmedTotal++;
+      } else {
+        break;
+      }
+    }
+
+    // Mismatch scan (two-pass rule): a half-parsed row on pass N is fully
+    // redrawn a few ms later, so only content foreign on TWO consecutive
+    // passes cascades. Blank cells are NEUTRAL, not foreign: codex clears its
+    // placeholder on the first echo, and the blanks left under later
+    // predictions are what "not yet echoed" looks like, not evidence of a
+    // redraw (measured 2026-08-09; without this, fast typing over the
+    // placeholder cascades exactly when RTT is high). TTL still bounds them.
+    let dropFrom = -1;
+    for (let i = 0; i < this._outstanding.length; i++) {
+      const rec = this._outstanding[i];
+      const cell = this._readCell(anchor.row, anchor.col + rec.offsetCells);
+      if (cell !== rec.snapshot && cell !== rec.char && cell !== ' ') {
+        rec.mismatches++;
+        if (rec.mismatches >= 2) {
+          dropFrom = i;
+          break;
+        }
+      } else {
+        rec.mismatches = 0;
+      }
+    }
+    if (dropFrom !== -1) this._dropFrom(dropFrom);
+
+    // TTL: the first stale record drops itself and everything after it.
+    for (let i = 0; i < this._outstanding.length; i++) {
+      if (now - this._outstanding[i].sentAt > this._options.ttlMs) {
+        this._dropFrom(i);
+        break;
+      }
+    }
+
+    if (this._outstanding.length === 0) {
+      this._resetRun();
+    } else {
+      this._armTtl();
+    }
+  }
+
+  private _dropFrom(index: number): void {
+    const dropped = this._outstanding.splice(index);
+    for (const rec of dropped) removePredictionSpan(this._spans, rec.seq);
+    this._droppedTotal += dropped.length;
+  }
+
+  private _resetRun(): void {
+    this._anchor = null;
+    this._cursorOffRowSince = null;
+    if (this._ttlTimer !== null) {
+      clearTimeout(this._ttlTimer);
+      this._ttlTimer = null;
+    }
+  }
+
+  private _armTtl(): void {
+    if (this._ttlTimer !== null) return;
+    const oldest = this._outstanding[0];
+    if (!oldest) return;
+    const delay = Math.max(0, oldest.sentAt + this._options.ttlMs - performance.now()) + 1;
+    this._ttlTimer = setTimeout(() => {
+      this._ttlTimer = null;
+      this._safeReconcile();
+      this._armTtl();
+    }, delay);
+  }
+
+  // ─── Cell access ──────────────────────────────────────────────────
+
+  private _hasGetCell(): boolean {
+    const buf = this._terminal?.buffer.active;
+    if (!buf) return false;
+    const line = buf.getLine(buf.baseY + (buf.cursorY ?? 0));
+    return typeof line?.getCell === 'function';
+  }
+
+  /** Read one cell's chars at (viewport-relative row, col); '' -> ' '. */
+  private _readCell(row: number, col: number): string {
+    const buf = this._terminal!.buffer.active;
+    const line = buf.getLine(buf.baseY + row);
+    if (!line) return ' ';
+    if (typeof line.getCell === 'function') {
+      const chars = line.getCell(col)?.getChars() ?? '';
+      return chars === '' ? ' ' : chars;
+    }
+    // ASCII fallback: code-unit index, misaligns after wide columns, which is
+    // why width-2 predictions are suppressed without getCell.
+    const text = line.translateToString(true);
+    return text[col] ?? ' ';
+  }
+
+  // ─── Font ─────────────────────────────────────────────────────────
+
+  /** Same recipe as the buffer addon's _cacheFont (kept private on purpose:
+   *  zerolag-input-addon.ts must stay untouched by this feature). */
+  private _readFontStyle(): void {
+    const t = this._terminal;
+    if (!t) return;
+    this._font.fontFamily = t.options.fontFamily || 'monospace';
+    this._font.fontSize = (t.options.fontSize || 14) + 'px';
+    this._font.fontWeight = String(t.options.fontWeight || 'normal');
+    this._font.backgroundColor = this._options.backgroundColor ?? t.options.theme?.background ?? DEFAULT_BG;
+    this._font.color = this._options.foregroundColor ?? t.options.theme?.foreground ?? DEFAULT_FG;
+    this._font.letterSpacing = '';
+    const rows = t.element?.querySelector('.xterm-rows');
+    if (rows) {
+      const cs = getComputedStyle(rows);
+      this._font.letterSpacing = cs.letterSpacing;
+      if (!this._options.foregroundColor && cs.color) this._font.color = cs.color;
+    }
+  }
+}

packages/xterm-zerolag-input/src/prompt-finder.ts

@@ -6,55 +6,50 @@ import type { XtermTerminal, PromptFinder, PromptPosition } from './types.js';
  *
  * @returns The prompt position (viewport-relative), or `null` if not found.
  */
-export function findPrompt(
-    terminal: XtermTerminal,
-    finder: PromptFinder,
-): PromptPosition | null {
-    try {
-        const buffer = terminal.buffer.active;
-        const viewportTop = buffer.viewportY;
+export function findPrompt(terminal: XtermTerminal, finder: PromptFinder): PromptPosition | null {
+  try {
+    const buffer = terminal.buffer.active;
+    const viewportTop = buffer.viewportY;
 
-        switch (finder.type) {
-            case 'character': {
-                for (let row = terminal.rows - 1; row >= 0; row--) {
-                    const line = buffer.getLine(viewportTop + row);
-                    if (!line) continue;
-                    const text = line.translateToString(true);
-                    const idx = text.lastIndexOf(finder.char);
-                    if (idx >= 0) return { row, col: idx };
-                }
-                return null;
-            }
-
-            case 'regex': {
-                // Create a fresh non-global regex to avoid lastIndex mutation
-                // and ensure .match() returns a single result with .index
-                const pattern = finder.pattern;
-                const safePattern = pattern.global
-                    ? new RegExp(pattern.source, pattern.flags.replace('g', ''))
-                    : pattern;
-                for (let row = terminal.rows - 1; row >= 0; row--) {
-                    const line = buffer.getLine(viewportTop + row);
-                    if (!line) continue;
-                    const text = line.translateToString(true);
-                    const match = text.match(safePattern);
-                    if (match) {
-                        const col = match.index ?? 0;
-                        return { row, col };
-                    }
-                }
-                return null;
-            }
-
-            case 'custom':
-                return finder.find(terminal);
-
-            default:
-                return null;
+    switch (finder.type) {
+      case 'character': {
+        for (let row = terminal.rows - 1; row >= 0; row--) {
+          const line = buffer.getLine(viewportTop + row);
+          if (!line) continue;
+          const text = line.translateToString(true);
+          const idx = text.lastIndexOf(finder.char);
+          if (idx >= 0) return { row, col: idx };
         }
-    } catch {
+        return null;
+      }
+
+      case 'regex': {
+        // Create a fresh non-global regex to avoid lastIndex mutation
+        // and ensure .match() returns a single result with .index
+        const pattern = finder.pattern;
+        const safePattern = pattern.global ? new RegExp(pattern.source, pattern.flags.replace('g', '')) : pattern;
+        for (let row = terminal.rows - 1; row >= 0; row--) {
+          const line = buffer.getLine(viewportTop + row);
+          if (!line) continue;
+          const text = line.translateToString(true);
+          const match = text.match(safePattern);
+          if (match) {
+            const col = match.index ?? 0;
+            return { row, col };
+          }
+        }
+        return null;
+      }
+
+      case 'custom':
+        return finder.find(terminal);
+
+      default:
         return null;
     }
+  } catch {
+    return null;
+  }
 }
 
 /**
@@ -65,19 +60,15 @@ export function findPrompt(
  * @param offset - Characters to skip after the prompt marker (e.g., 2 for "> ")
  * @returns The text after the prompt, trimmed. Empty string if nothing found.
  */
-export function readTextAfterPrompt(
-    terminal: XtermTerminal,
-    prompt: PromptPosition,
-    offset: number,
-): string {
-    try {
-        const buffer = terminal.buffer.active;
-        const absRow = buffer.viewportY + prompt.row;
-        const line = buffer.getLine(absRow);
-        if (!line) return '';
-        const lineText = line.translateToString(true);
-        return lineText.slice(prompt.col + offset).trimEnd();
-    } catch {
-        return '';
-    }
+export function readTextAfterPrompt(terminal: XtermTerminal, prompt: PromptPosition, offset: number): string {
+  try {
+    const buffer = terminal.buffer.active;
+    const absRow = buffer.viewportY + prompt.row;
+    const line = buffer.getLine(absRow);
+    if (!line) return '';
+    const lineText = line.translateToString(true);
+    return lineText.slice(prompt.col + offset).trimEnd();
+  } catch {
+    return '';
+  }
 }

packages/xterm-zerolag-input/src/types.ts

@@ -22,9 +22,15 @@ export interface XtermTerminal {
     readonly active: {
       readonly viewportY: number;
       readonly baseY: number;
+      /** Cursor column (0-based). Used by PredictiveEchoAddon. */
+      readonly cursorX?: number;
+      /** Cursor row, relative to baseY (0-based). Used by PredictiveEchoAddon. */
+      readonly cursorY?: number;
       getLine(y: number):
         | {
             translateToString(trimRight?: boolean): string;
+            /** Cell access (xterm public API). Optional: mocks/exotic hosts may omit it. */
+            getCell?(x: number): { getChars(): string; getWidth(): number } | undefined;
           }
         | undefined;
     };
@@ -34,6 +40,10 @@ export interface XtermTerminal {
     getStringCellWidth(str: string): number;
     activeVersion?: string;
   };
+  /** Fires after the parser finishes a write chunk. Used by PredictiveEchoAddon. */
+  onWriteParsed?(cb: () => void): { dispose(): void };
+  /** Fires on terminal resize. Used by PredictiveEchoAddon. */
+  onResize?(cb: (size: { cols: number; rows: number }) => void): { dispose(): void };
 }
 
 /**

packages/xterm-zerolag-input/test/cell-dimensions.test.ts

@@ -6,122 +6,125 @@ import type { XtermTerminal } from '../src/types.js';
 let cleanups: (() => void)[] = [];
 
 afterEach(() => {
-    for (const fn of cleanups) fn();
-    cleanups = [];
+  for (const fn of cleanups) fn();
+  cleanups = [];
 });
 
 describe('getCellDimensions', () => {
-    describe('v5 private API (mock _core._renderService)', () => {
-        it('returns cell width and height from css.cell', () => {
-            const mock = createMockTerminal({ cellWidth: 8.4, cellHeight: 19 });
-            cleanups.push(mock.cleanup);
-            const dims = getCellDimensions(mock.terminal as unknown as XtermTerminal);
-            expect(dims).not.toBeNull();
-            expect(dims!.width).toBe(8.4);
-            expect(dims!.height).toBe(19);
-        });
-
-        it('returns charTop from device.char.top divided by DPR', () => {
-            const mock = createMockTerminal({
-                cellWidth: 8, cellHeight: 19,
-                deviceCharTop: 2,
-            });
-            cleanups.push(mock.cleanup);
-            const dims = getCellDimensions(mock.terminal as unknown as XtermTerminal);
-            expect(dims).not.toBeNull();
-            // DPR=1 in jsdom, so charTop = 2 / 1 = 2
-            expect(dims!.charTop).toBe(2);
-        });
-
-        it('returns charHeight from device.char.height divided by DPR', () => {
-            const mock = createMockTerminal({
-                cellWidth: 8, cellHeight: 19,
-                deviceCharHeight: 16,
-            });
-            cleanups.push(mock.cleanup);
-            const dims = getCellDimensions(mock.terminal as unknown as XtermTerminal);
-            expect(dims).not.toBeNull();
-            // DPR=1, so charHeight = 16 / 1 = 16
-            expect(dims!.charHeight).toBe(16);
-        });
-
-        it('defaults charTop to 0 when device.char not present', () => {
-            // Default mock has deviceCharTop=0
-            const mock = createMockTerminal({ cellWidth: 8, cellHeight: 19 });
-            cleanups.push(mock.cleanup);
-            const dims = getCellDimensions(mock.terminal as unknown as XtermTerminal);
-            expect(dims!.charTop).toBe(0);
-        });
-
-        it('defaults charHeight to cellH when device.char.height not set', () => {
-            // Default mock has deviceCharHeight=cellH
-            const mock = createMockTerminal({ cellWidth: 8, cellHeight: 19 });
-            cleanups.push(mock.cleanup);
-            const dims = getCellDimensions(mock.terminal as unknown as XtermTerminal);
-            expect(dims!.charHeight).toBe(19);
-        });
+  describe('v5 private API (mock _core._renderService)', () => {
+    it('returns cell width and height from css.cell', () => {
+      const mock = createMockTerminal({ cellWidth: 8.4, cellHeight: 19 });
+      cleanups.push(mock.cleanup);
+      const dims = getCellDimensions(mock.terminal as unknown as XtermTerminal);
+      expect(dims).not.toBeNull();
+      expect(dims!.width).toBe(8.4);
+      expect(dims!.height).toBe(19);
     });
 
-    describe('DPR simulation', () => {
-        const originalDPR = globalThis.devicePixelRatio;
-
-        beforeEach(() => {
-            // Set DPR=2 to test division
-            Object.defineProperty(globalThis, 'devicePixelRatio', {
-                value: 2,
-                writable: true,
-                configurable: true,
-            });
-        });
-
-        afterEach(() => {
-            Object.defineProperty(globalThis, 'devicePixelRatio', {
-                value: originalDPR,
-                writable: true,
-                configurable: true,
-            });
-        });
-
-        it('divides device.char.top by DPR', () => {
-            const mock = createMockTerminal({
-                cellWidth: 16, cellHeight: 38,
-                deviceCharTop: 4,
-                deviceCharHeight: 32,
-            });
-            cleanups.push(mock.cleanup);
-            const dims = getCellDimensions(mock.terminal as unknown as XtermTerminal);
-            expect(dims).not.toBeNull();
-            // charTop = 4 / 2 = 2
-            expect(dims!.charTop).toBe(2);
-            // charHeight = 32 / 2 = 16
-            expect(dims!.charHeight).toBe(16);
-        });
+    it('returns charTop from device.char.top divided by DPR', () => {
+      const mock = createMockTerminal({
+        cellWidth: 8,
+        cellHeight: 19,
+        deviceCharTop: 2,
+      });
+      cleanups.push(mock.cleanup);
+      const dims = getCellDimensions(mock.terminal as unknown as XtermTerminal);
+      expect(dims).not.toBeNull();
+      // DPR=1 in jsdom, so charTop = 2 / 1 = 2
+      expect(dims!.charTop).toBe(2);
     });
 
-    describe('null cases', () => {
-        it('returns null for terminal without _core', () => {
-            const terminal = {
-                element: document.createElement('div'),
-                cols: 80,
-                rows: 24,
-                options: {},
-                buffer: { active: { viewportY: 0, baseY: 0, getLine: () => undefined } },
-            } as unknown as XtermTerminal;
-            const dims = getCellDimensions(terminal);
-            expect(dims).toBeNull();
-        });
-
-        it('returns null for terminal with no dimensions', () => {
-            const terminal = {
-                element: document.createElement('div'),
-                cols: 80,
-                rows: 24,
-                options: {},
-                buffer: { active: { viewportY: 0, baseY: 0, getLine: () => undefined } },
-                _core: { _renderService: {} },
-            } as unknown as XtermTerminal;
-            const dims = getCellDimensions(terminal);
-            expect(dims).toBeNull();
-        });
+    it('returns charHeight from device.char.height divided by DPR', () => {
+      const mock = createMockTerminal({
+        cellWidth: 8,
+        cellHeight: 19,
+        deviceCharHeight: 16,
+      });
+      cleanups.push(mock.cleanup);
+      const dims = getCellDimensions(mock.terminal as unknown as XtermTerminal);
+      expect(dims).not.toBeNull();
+      // DPR=1, so charHeight = 16 / 1 = 16
+      expect(dims!.charHeight).toBe(16);
     });
+
+    it('defaults charTop to 0 when device.char not present', () => {
+      // Default mock has deviceCharTop=0
+      const mock = createMockTerminal({ cellWidth: 8, cellHeight: 19 });
+      cleanups.push(mock.cleanup);
+      const dims = getCellDimensions(mock.terminal as unknown as XtermTerminal);
+      expect(dims!.charTop).toBe(0);
+    });
+
+    it('defaults charHeight to cellH when device.char.height not set', () => {
+      // Default mock has deviceCharHeight=cellH
+      const mock = createMockTerminal({ cellWidth: 8, cellHeight: 19 });
+      cleanups.push(mock.cleanup);
+      const dims = getCellDimensions(mock.terminal as unknown as XtermTerminal);
+      expect(dims!.charHeight).toBe(19);
+    });
+  });
+
+  describe('DPR simulation', () => {
+    const originalDPR = globalThis.devicePixelRatio;
+
+    beforeEach(() => {
+      // Set DPR=2 to test division
+      Object.defineProperty(globalThis, 'devicePixelRatio', {
+        value: 2,
+        writable: true,
+        configurable: true,
+      });
+    });
+
+    afterEach(() => {
+      Object.defineProperty(globalThis, 'devicePixelRatio', {
+        value: originalDPR,
+        writable: true,
+        configurable: true,
+      });
+    });
+
+    it('divides device.char.top by DPR', () => {
+      const mock = createMockTerminal({
+        cellWidth: 16,
+        cellHeight: 38,
+        deviceCharTop: 4,
+        deviceCharHeight: 32,
+      });
+      cleanups.push(mock.cleanup);
+      const dims = getCellDimensions(mock.terminal as unknown as XtermTerminal);
+      expect(dims).not.toBeNull();
+      // charTop = 4 / 2 = 2
+      expect(dims!.charTop).toBe(2);
+      // charHeight = 32 / 2 = 16
+      expect(dims!.charHeight).toBe(16);
+    });
+  });
+
+  describe('null cases', () => {
+    it('returns null for terminal without _core', () => {
+      const terminal = {
+        element: document.createElement('div'),
+        cols: 80,
+        rows: 24,
+        options: {},
+        buffer: { active: { viewportY: 0, baseY: 0, getLine: () => undefined } },
+      } as unknown as XtermTerminal;
+      const dims = getCellDimensions(terminal);
+      expect(dims).toBeNull();
+    });
+
+    it('returns null for terminal with no dimensions', () => {
+      const terminal = {
+        element: document.createElement('div'),
+        cols: 80,
+        rows: 24,
+        options: {},
+        buffer: { active: { viewportY: 0, baseY: 0, getLine: () => undefined } },
+        _core: { _renderService: {} },
+      } as unknown as XtermTerminal;
+      const dims = getCellDimensions(terminal);
+      expect(dims).toBeNull();
+    });
+  });
 });

packages/xterm-zerolag-input/test/codex-replay.test.ts

@@ -0,0 +1,188 @@
+/**
+ * @vitest-environment jsdom
+ *
+ * Layer 2 (the load-bearing suite): the REAL algorithm against the REAL xterm
+ * parser, fed by fixtures recorded from real codex 0.147 through the
+ * production pipeline (tmux + the codex full strip). See
+ * scripts/dev/record-codex-frames.mjs in the consuming repo.
+ *
+ * Every replay ends with the convergence invariant: predictions never outlive
+ * their run (outstanding 0, span container empty).
+ */
+import { describe, expect, it } from 'vitest';
+import { PredictiveEchoAddon } from '../src/predictive-echo-addon.js';
+import {
+  CELL_H,
+  CELL_W,
+  classifyPredictInput,
+  codexComposerGate,
+  createReplayTerminal,
+  loadFixture,
+  type ReplayTerminal,
+} from './replay-helpers.js';
+
+async function flushMicrotasks() {
+  await Promise.resolve();
+  await Promise.resolve();
+}
+
+function sleep(ms: number) {
+  return new Promise((r) => setTimeout(r, ms));
+}
+
+interface KeyEvent {
+  key: string;
+  kind: ReturnType<typeof classifyPredictInput>;
+  painted: boolean;
+  spansAfter: number;
+}
+
+function assertSpansInGrid(rt: ReplayTerminal) {
+  for (const s of rt.spans()) {
+    const left = parseFloat(s.style.left);
+    const width = parseFloat(s.style.width);
+    const top = parseFloat(s.style.top);
+    expect(left + width).toBeLessThanOrEqual(rt.hybrid.cols * CELL_W);
+    expect(top).toBeLessThanOrEqual((rt.hybrid.rows - 1) * CELL_H);
+    expect(left).toBeGreaterThanOrEqual(0);
+    expect(top).toBeGreaterThanOrEqual(0);
+  }
+}
+
+async function replay(name: string) {
+  const { meta, lines } = loadFixture(name);
+  const rt = createReplayTerminal(meta.cols, meta.rows);
+  const addon = new PredictiveEchoAddon({ predictWhen: codexComposerGate });
+  addon.activate(rt.hybrid);
+
+  const events: KeyEvent[] = [];
+  for (const line of lines) {
+    if (line.keyAt) {
+      const kind = classifyPredictInput(line.data);
+      let painted = false;
+      if (kind === 'char') painted = addon.predictChar(line.data);
+      else if (kind === 'backspace') addon.predictBackspace();
+      else addon.clearPredictions(); // 'clear' AND 'text', like the terminal-ui hook
+      // Span/record parity and grid bounds hold at every step
+      expect(rt.spanCount()).toBe(addon.state.outstanding);
+      assertSpansInGrid(rt);
+      events.push({ key: line.data, kind, painted, spansAfter: rt.spanCount() });
+    } else {
+      await rt.write(line.data);
+      await flushMicrotasks();
+    }
+  }
+  return { rt, addon, events, meta };
+}
+
+/** Convergence invariant: after the last chunk + reconcile (+ TTL if needed),
+ *  nothing outlives the run. */
+async function converge(rt: ReplayTerminal, addon: PredictiveEchoAddon) {
+  addon.reconcile();
+  if (addon.state.outstanding > 0) {
+    await sleep(1100); // ttlMs default
+    addon.reconcile();
+  }
+  expect(addon.state.outstanding).toBe(0);
+  expect(rt.spanCount()).toBe(0);
+}
+
+describe('codex replay', () => {
+  it('type-hello: all 5 predictions confirm, zero drops, composer converges', async () => {
+    const { rt, addon, events } = await replay('type-hello');
+    const chars = events.filter((e) => e.kind === 'char');
+    expect(chars).toHaveLength(5);
+    expect(chars.every((e) => e.painted)).toBe(true);
+    await converge(rt, addon);
+    expect(addon.state.confirmedTotal).toBe(5);
+    expect(addon.state.droppedTotal).toBe(0);
+    expect(rt.cursorRowText()).toBe('› hello');
+    addon.dispose();
+    rt.cleanup();
+  }, 15000);
+
+  it('slash-picker: "/" and filter chars confirm; no ghosts while picker rows redraw', async () => {
+    const { rt, addon, events } = await replay('slash-picker');
+    const chars = events.filter((e) => e.kind === 'char');
+    expect(chars.map((e) => e.key)).toEqual(['/', 'm', 'o']);
+    expect(chars.every((e) => e.painted)).toBe(true);
+    await converge(rt, addon);
+    expect(addon.state.confirmedTotal).toBe(3);
+    expect(addon.state.droppedTotal).toBe(0);
+    addon.dispose();
+    rt.cleanup();
+  }, 15000);
+
+  it('wrap: predictions stay inside the grid, continuation rows fall back to real echo, buffer converges', async () => {
+    const { rt, addon, events } = await replay('wrap');
+    // The gate goes false once the cursor is on a wrapped continuation row
+    // (2-space indent, no "› "): a tail of keystrokes must be suppressed.
+    const chars = events.filter((e) => e.kind === 'char');
+    expect(chars.some((e) => !e.painted)).toBe(true);
+    expect(chars.some((e) => e.painted)).toBe(true);
+    await converge(rt, addon);
+    // The composer content is exactly what was typed (word-wrapped)
+    const b = rt.term.buffer.active;
+    const cursorRow = b.cursorY;
+    expect(rt.rowText(cursorRow).trim()).toBe('this line twice over');
+    expect(rt.rowText(cursorRow - 1)).toMatch(/^› the quick brown fox/);
+    addon.dispose();
+    rt.cleanup();
+  }, 15000);
+
+  it('streaming-burst: typed predictions confirm; the re-rendered composer keeps its signature', async () => {
+    const { rt, addon, events } = await replay('streaming-burst');
+    const chars = events.filter((e) => e.kind === 'char');
+    expect(chars).toHaveLength(5); // "hello" (the \r is kind 'clear')
+    await converge(rt, addon);
+    expect(addon.state.confirmedTotal).toBe(5);
+    expect(addon.state.droppedTotal).toBe(0);
+    // After the 401 burst codex re-renders a fresh composer at the cursor
+    expect(rt.cursorRowText()).toMatch(/^› /);
+    addon.dispose();
+    rt.cleanup();
+  }, 15000);
+
+  it('streaming-real: mid-stream typing survives real baseY growth (recorded with real auth)', async () => {
+    // The one shape the fake-key lab cannot produce: a genuine model reply
+    // streaming above the pinned composer pushes lines into history, so
+    // baseY GROWS while predictions are outstanding: the no-drop-on-baseY
+    // rule against reality instead of a synthetic scroll.
+    const { rt, addon, events } = await replay('streaming-real');
+    expect(rt.term.buffer.active.baseY).toBeGreaterThan(0); // history really grew
+    const midStream = events.filter((e) => e.kind === 'char' && ['a', 'b', 'c'].includes(e.key));
+    expect(midStream.length).toBe(3);
+    expect(midStream.some((e) => e.painted)).toBe(true); // predictions ran mid-stream
+    await converge(rt, addon);
+    expect(rt.cursorRowText()).toBe('› abc'); // the mid-stream chars landed intact
+    addon.dispose();
+    rt.cleanup();
+  }, 15000);
+
+  it('paste-bracketed: typed chars confirm, the paste clears predictions, content intact', async () => {
+    const { rt, addon, events } = await replay('paste-bracketed');
+    const paste = events.find((e) => e.key.startsWith('\x1b[200~'))!;
+    expect(paste.kind).toBe('clear');
+    expect(paste.spansAfter).toBe(0);
+    await converge(rt, addon);
+    expect(addon.state.confirmedTotal).toBe(2); // 'a', 'b'
+    expect(rt.cursorRowText()).toContain('abXYZpasted');
+    addon.dispose();
+    rt.cleanup();
+  }, 15000);
+
+  it('trust-modal: the predictWhen gate paints ZERO spans on the modal (ghost eliminator)', async () => {
+    const { rt, addon, events } = await replay('trust-modal');
+    const x = events.find((e) => e.key === 'x')!;
+    expect(x.painted).toBe(false);
+    expect(x.spansAfter).toBe(0);
+    expect(events.every((e) => e.spansAfter === 0)).toBe(true);
+    await converge(rt, addon);
+    expect(addon.state.confirmedTotal).toBe(0);
+    expect(addon.state.droppedTotal).toBe(0);
+    // The transition landed on the real composer afterwards
+    expect(rt.cursorRowText()).toMatch(/^› /);
+    addon.dispose();
+    rt.cleanup();
+  }, 15000);
+});

packages/xterm-zerolag-input/test/fixtures/codex/paste-bracketed.jsonl

@@ -0,0 +1,28 @@
+{"scenario":"paste-bracketed","cols":100,"rows":30,"codexVersion":"codex-cli 0.147.0","recordedAt":"2026-08-09T01:51:11.762Z"}
+{"delayMs":0,"data":"\u001b[22;0;0t\u001b[?1h\u001b=\u001b[H\u001b[2J\u001b[?12l\u001b[?25h\u001b[?2004h\u001b(B\u001b[m\u001b[?12l\u001b[?25h\u001b[1;1H\u001b[1;30r\u001b[c\u001b[>c\u001b[>q\u001b]10;?\u001b\\\u001b]11;?\u001b\\\u001b[1;1H\u001b[?25l\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\u001b[?12l\u001b[?25h\u001b[H"}
+{"delayMs":0,"data":"\u001b(B\u001b[m\u001b[?12l\u001b[?25h\u001b[1;1H\u001b[1;30r\u001b[1;1H"}
+{"delayMs":0,"data":"\u001b[?25l\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\u001b[?12l\u001b[?25h\u001b[H"}
+{"delayMs":45,"data":"\u001b[32m\u001b[1markon@tnode\u001b(B\u001b[m:\u001b[34m\u001b[1m~/default/claudeman-predictive/tmp/codexrec-work-bWhHjh\u001b(B\u001b[m$ "}
+{"delayMs":638,"data":"exec codex\r\n"}
+{"delayMs":420,"data":"\u001b[?25l\u001b[?12l\u001b[?25h"}
+{"delayMs":182,"data":"\u001b[?25l\u001b[?12l\u001b[?25h"}
+{"delayMs":5,"data":"\r\n\u001b[J\u001b[A\u001b[K"}
+{"delayMs":0,"data":"\u001b[2;30r\u001b[2;1H\u001bM\u001bM\u001bM\u001b[33m⚠ Codex could not find bubblewrap on PATH. Install bubblewrap with your OS package manager. See the\r\n\u001b[39m  \u001b[33msandbox prerequisites: https://developers.openai.com/codex/concepts/sandboxing#prerequisites.\u001b[1;30r\u001b[4;1H\u001b(B\u001b[m"}
+{"delayMs":1,"data":"  \u001b[33mCodex will use the bundled bubblewrap in the meantime.\u001b[6;1H\u001b[39m\u001b[2m╭─────────────────────────────────────────────────╮\r\n│ >_ \u001b(B\u001b[m\u001b[1mOpenAI Codex\u001b(B\u001b[m\u001b[2m (v0.147.0)                      │\r\n│                                                 │\r\n│ model:     \u001b[3mloading\u001b(B\u001b[m\u001b[2m   \u001b(B\u001b[m\u001b[36m/model\u001b[39m\u001b[2m to change           │\r\n│ directory: \u001b(B\u001b[m~/default/…/tmp/codexrec-work-bWhHjh\u001b[2m │\r\n╰─────────────────────────────────────────────────╯\u001b[14;1H\u001b(B\u001b[m\u001b[1m›\u001b[C\u001b(B\u001b[m\u001b[2mSummarize rec\u001b(B\u001b[m\u001b[2ment commits\u001b[16;3H\u001b(B\u001b[m\u001b[38;5;223mgpt-5.6-sol default\u001b[39m\u001b[2m · \u001b(B\u001b[m\u001b[38;5;151m~/default/claudeman-predictive/tmp/codexrec-work-bWhHjh\u001b[14;3H\u001b(B\u001b[m"}
+{"delayMs":7,"data":"\u001b[6;52H\u001b[K\n\u001b[K\n\u001b[K\n\u001b[K\n\u001b[K\n\u001b[K\u001b[14;27H\u001b[K\u001b[16;80H\u001b[K\u001b[14;3H"}
+{"delayMs":21,"data":"\u001b[6;52H\u001b[K\n\u001b[K\n\u001b[K\n\u001b[K\n\u001b[K\n\u001b[K\u001b[14;27H\u001b[K\u001b[16;80H\u001b[K\u001b[14;3H"}
+{"delayMs":8,"data":"\u001b[6;52H\u001b[K\n\u001b[K\n\u001b[K\n\u001b[K\n\u001b[K\n\u001b[K\u001b[14;27H\u001b[K\u001b[16;80H\u001b[K\u001b[14;3H"}
+{"delayMs":159,"data":"\u001b[6;1H\u001b[J\u001b[A\u001b[K"}
+{"delayMs":0,"data":"\u001b[2B\u001b[1m›\u001b[C\u001b(B\u001b[m\u001b[2mSummarize recent commits\u001b[9;3H\u001b(B\u001b[m\u001b[38;5;223mgpt-5.6-sol default\u001b[39m\u001b[2m · \u001b(B\u001b[m\u001b[38;5;151m~/default/claudeman-predictive/tmp/codexrec-work-bWhHjh\u001b[7;3H\u001b(B\u001b[m"}
+{"delayMs":21,"data":"\u001b[5;30r\u001b[5;1H\u001bM\u001bM\u001bM\u001bM\u001bM\u001bM\u001bM\u001bM\u001bM\u001bM\u001bM\r\n\u001b[2m╭─────────────────────────────────────────────────╮\u001b[1;30r\u001b[7;1H\u001b(B\u001b[m\u001b[2m│ >_ \u001b(B\u001b[m\u001b[1mOpenAI Codex\u001b(B\u001b[m\u001b[2m (v0.147.0)                      │\r\n│                                                 │\r\n│ model:     \u001b(B\u001b[mgpt-5.6-sol\u001b[2m   \u001b(B\u001b[m\u001b[36m/model\u001b[39m\u001b[2m to change       │\r\n│ directory: \u001b(B\u001b[m~/default/…/tmp/codexrec-work-bWhHjh\u001b[2m │\r\n╰─────────────────────────────────────────────────╯\u001b[13;1H\u001b(B\u001b[m  \u001b[1mTip:\u001b(B\u001b[m Our most capable model yet. GPT-5.6 Sol can tackle complex code changes, dig into research,\r\n  produce polished documents, and take on your most ambitious work. Sol is highly capable at lower\r\n"}
+{"delayMs":0,"data":"  reasoning efforts—try starting lower, then turn it up for harder jobs.\u001b[18;27H\u001b[K\u001b[20;80H\u001b[K\u001b[18;3H"}
+{"delayMs":0,"data":"\u001b[24C\u001b[K\u001b[20;80H\u001b[K\u001b[18;3H"}
+{"delayMs":0,"data":"\u001b[24C\u001b[K\u001b[20;80H\u001b[K\u001b[18;3H"}
+{"delayMs":3487,"data":"\u001b[?7727h\u001b(B\u001b[m\u001b[?12l\u001b[?25h\u001b[1;1H\u001b[1;30r\u001b[18;3H"}
+{"delayMs":0,"data":"\u001b[?25l\u001b[32m\u001b[1m\u001b[Harkon@tnode\u001b(B\u001b[m:\u001b[34m\u001b[1m~/default/claudeman-predictive/tmp/codexrec-work-bWhHjh\u001b(B\u001b[m$ exec codex\u001b[K\u001b[33m\r\n⚠ Codex could not find bubblewrap on PATH. Install bubblewrap with your OS package manager. See the\u001b[39m\u001b[K\r\n  \u001b[33msandbox prerequisites: https://developers.openai.com/codex/concepts/sandboxing#prerequisites.\u001b[39m\u001b[K\r\n  \u001b[33mCodex will use the bundled bubblewrap in the meantime.\u001b[39m\u001b[K\r\n\u001b[K\u001b[2m\r\n╭─────────────────────────────────────────────────╮\u001b(B\u001b[m\u001b[K\u001b[2m\r\n│ >_ \u001b(B\u001b[m\u001b[1mOpenAI Codex\u001b(B\u001b[m\u001b[2m (v0.147.0)                      │\u001b(B\u001b[m\u001b[K\u001b[2m\r\n│                                                 │\u001b(B\u001b[m\u001b[K\u001b[2m\r\n│ model:     \u001b(B\u001b[mgpt-5.6-sol\u001b[2m   \u001b(B\u001b[m\u001b[36m/model\u001b[39m\u001b[2m to change       │\u001b(B\u001b[m\u001b[K\u001b[2m\r\n│ directory: \u001b(B\u001b[m~/default/…/tmp/codexrec-work-bWhHjh\u001b[2m │\u001b(B\u001b[m\u001b[K\u001b[2m\r\n╰─────────────────────────────────────────────────╯\u001b(B\u001b[m\u001b[K\r\n\u001b[K\r\n  \u001b[1mTip:\u001b(B\u001b[m Our most capable model yet. GPT-5.6 Sol can tackle complex code changes, dig into research,\u001b[K\r\n  produce polished documents, and take on your most ambitious work. Sol is highly capable at lower\u001b[K\r\n  reasoning efforts—try starting lower, then turn it up for harder jobs.\u001b[K\r\n\u001b[K\r\n\u001b[K\u001b[1m\r\n›\u001b(B\u001b[m\u001b[1X\u001b[2m\u001b[CSummarize recent commits\u001b(B\u001b[m\u001b[K\r\n\u001b[K\u001b[20;2H\u001b[1K\u001b[38;5;223m\u001b[Cgpt-5.6-sol default\u001b[39m\u001b[2m · \u001b(B\u001b[m\u001b[38;5;151m~/default/claudeman-predictive/tmp/codexrec-work-bWhHjh\u001b[39m\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\u001b[?12l\u001b[?25h\u001b[18;3H"}
+{"keyAt":true,"data":"a"}
+{"delayMs":207,"data":"a\u001b[K\u001b[20;80H\u001b[K\u001b[18;4H"}
+{"keyAt":true,"data":"b"}
+{"delayMs":91,"data":"b\u001b[K\u001b[20;80H\u001b[K\u001b[18;5H"}
+{"keyAt":true,"data":"\u001b[200~XYZpasted\u001b[201~"}
+{"delayMs":383,"data":"XYZpasted\u001b[K\u001b[20;80H\u001b[K\u001b[18;14H"}

packages/xterm-zerolag-input/test/fixtures/codex/slash-picker.jsonl

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+{"scenario":"slash-picker","cols":100,"rows":30,"codexVersion":"codex-cli 0.147.0","recordedAt":"2026-08-09T01:50:42.069Z"}
+{"delayMs":0,"data":"\u001b[22;0;0t\u001b[?1h\u001b=\u001b[H\u001b[2J\u001b[?12l\u001b[?25h\u001b[?2004h\u001b(B\u001b[m\u001b[?12l\u001b[?25h\u001b[1;1H\u001b[1;30r\u001b[c\u001b[>c\u001b[>q\u001b]10;?\u001b\\\u001b]11;?\u001b\\\u001b[1;1H"}
+{"delayMs":0,"data":"\u001b[?25l\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\u001b[?12l\u001b[?25h\u001b[H"}
+{"delayMs":0,"data":"\u001b(B\u001b[m\u001b[?12l\u001b[?25h\u001b[1;1H\u001b[1;30r\u001b[1;1H"}
+{"delayMs":0,"data":"\u001b[?25l\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\u001b[?12l\u001b[?25h\u001b[H"}
+{"delayMs":37,"data":"\u001b[32m\u001b[1markon@tnode\u001b(B\u001b[m:\u001b[34m\u001b[1m~/default/claudeman-predictive/tmp/codexrec-work-bw9Uto\u001b(B\u001b[m$ "}
+{"delayMs":647,"data":"exec codex\r\n"}
+{"delayMs":437,"data":"\u001b[?25l\u001b[?12l\u001b[?25h"}
+{"delayMs":183,"data":"\u001b[?25l\u001b[?12l\u001b[?25h"}
+{"delayMs":8,"data":"\r\n\u001b[J\u001b[A\u001b[K\u001b[2;30r\u001b[2;1H\u001bM\u001bM\u001bM\u001b[33m⚠ Codex could not find bubblewrap on PATH. Install bubblewrap with your OS package manager. See the\r\n\u001b[39m  \u001b[33msandbox prerequisites: https://developers.openai.com/codex/concepts/sandboxing#prerequisites.\r\n\u001b[39m  \u001b[33mCodex will use the bundled bubblewrap in the meantime.\u001b[6;1H\u001b[39m\u001b[2m╭─────────────────────────────────────────────────╮\r\n│ >_ \u001b(B\u001b[m\u001b[1mOpenAI Codex\u001b(B\u001b[m\u001b[2m (v0.147.0)                      │\r\n│                                                 │\r\n│ model:     \u001b[3mloading\u001b(B\u001b[m\u001b[2m   \u001b(B\u001b[m\u001b[36m/model\u001b[39m\u001b[2m to change           │\r\n│ directory: \u001b(B\u001b[m~/default/…/tmp/codexrec-work-bw9Uto\u001b[2m │\r\n╰─────────────────────────────────────────────────╯\u001b[14;1H\u001b(B\u001b[m\u001b[1m›\u001b[C\u001b(B\u001b[m\u001b[2mUse /skills to list available skills\u001b[16;3H\u001b(B\u001b[m\u001b[38;5;223mgpt-5.6-sol default\u001b[39m\u001b[2m · \u001b(B\u001b[m\u001b[38;5;151m~/default/claudeman-predictive/tmp/codexrec-work-bw9Uto\u001b[1;30r\u001b[14;3H\u001b(B\u001b[m"}
+{"delayMs":9,"data":"\u001b[6;52H\u001b[K\n\u001b[K\n\u001b[K\n\u001b[K\n\u001b[K\n\u001b[K\u001b[14;39H\u001b[K\u001b[16;80H\u001b[K\u001b[14;3H"}
+{"delayMs":12,"data":"\u001b[6;52H\u001b[K\n\u001b[K\n\u001b[K\n\u001b[K\n\u001b[K\n\u001b[K\u001b[14;39H\u001b[K\u001b[16;80H\u001b[K\u001b[14;3H"}
+{"delayMs":10,"data":"\u001b[6;52H\u001b[K\n\u001b[K\n\u001b[K\n\u001b[K\n\u001b[K\n\u001b[K\u001b[14;39H\u001b[K\u001b[16;80H\u001b[K\u001b[14;3H"}
+{"delayMs":157,"data":"\u001b[6;1H\u001b[J\u001b[A\u001b[K"}
+{"delayMs":0,"data":"\u001b[2B\u001b[1m›\u001b[C\u001b(B\u001b[m\u001b[2mUse /skills to list available skills\u001b[9;3H\u001b(B\u001b[m\u001b[38;5;223mgpt-5.6-sol default\u001b[39m\u001b[2m · \u001b(B\u001b[m\u001b[38;5;151m~/default/claudeman-predictive/tmp/codexrec-work-bw9Uto\u001b[7;3H\u001b(B\u001b[m"}
+{"delayMs":20,"data":"\u001b[5;30r\u001b[5;1H\u001bM\u001bM\u001bM\u001bM\u001bM\u001bM\u001bM\u001bM\u001bM\u001bM\u001bM\r\n\u001b[2m╭─────────────────────────────────────────────────╮\u001b[1;30r\u001b[7;1H\u001b(B\u001b[m"}
+{"delayMs":0,"data":"\u001b[2m│ >_ \u001b(B\u001b[m\u001b[1mOpenAI Codex\u001b(B\u001b[m\u001b[2m (v0.147.0)                      │\r\n│                                                 │\r\n│ model:     \u001b(B\u001b[mgpt-5.6-sol\u001b[2m   \u001b(B\u001b[m\u001b[36m/model\u001b[39m\u001b[2m to change       │\r\n│ directory: \u001b(B\u001b[m~/default/…/tmp/codexrec-work-bw9Uto\u001b[2m │\r\n╰─────────────────────────────────────────────────╯\u001b[13;1H\u001b(B\u001b[m  \u001b[1mTip:\u001b(B\u001b[m Our most capable model yet. GPT-5.6 Sol can tackle complex code changes, dig into research,\r\n  produce polished documents, and take on your most ambitious work. Sol is highly capable at lower\r\n"}
+{"delayMs":0,"data":"  reasoning efforts—try starting lower, then turn it up for harder jobs.\u001b[18;39H\u001b[K\u001b[20;80H\u001b[K\u001b[18;3H"}
+{"delayMs":0,"data":"\u001b[36C\u001b[K\u001b[20;80H\u001b[K\u001b[18;3H"}
+{"delayMs":0,"data":"\u001b[36C\u001b[K\u001b[20;80H\u001b[K\u001b[18;3H"}
+{"delayMs":3476,"data":"\u001b[?7727h\u001b(B\u001b[m\u001b[?12l\u001b[?25h\u001b[1;1H\u001b[1;30r\u001b[18;3H"}
+{"delayMs":0,"data":"\u001b[?25l\u001b[32m\u001b[1m\u001b[Harkon@tnode\u001b(B\u001b[m:\u001b[34m\u001b[1m~/default/claudeman-predictive/tmp/codexrec-work-bw9Uto\u001b(B\u001b[m$ exec codex\u001b[K\u001b[33m\r\n⚠ Codex could not find bubblewrap on PATH. Install bubblewrap with your OS package manager. See the\u001b[39m\u001b[K\r\n  \u001b[33msandbox prerequisites: https://developers.openai.com/codex/concepts/sandboxing#prerequisites.\u001b[39m\u001b[K\r\n  \u001b[33mCodex will use the bundled bubblewrap in the meantime.\u001b[39m\u001b[K\r\n\u001b[K\u001b[2m\r\n╭─────────────────────────────────────────────────╮\u001b(B\u001b[m\u001b[K\u001b[2m\r\n│ >_ \u001b(B\u001b[m\u001b[1mOpenAI Codex\u001b(B\u001b[m\u001b[2m (v0.147.0)                      │\u001b(B\u001b[m\u001b[K\u001b[2m\r\n│                                                 │\u001b(B\u001b[m\u001b[K\u001b[2m\r\n│ model:     \u001b(B\u001b[mgpt-5.6-sol\u001b[2m   \u001b(B\u001b[m\u001b[36m/model\u001b[39m\u001b[2m to change       │\u001b(B\u001b[m\u001b[K\u001b[2m\r\n│ directory: \u001b(B\u001b[m~/default/…/tmp/codexrec-work-bw9Uto\u001b[2m │\u001b(B\u001b[m\u001b[K\u001b[2m\r\n╰─────────────────────────────────────────────────╯\u001b(B\u001b[m\u001b[K\r\n\u001b[K\r\n  \u001b[1mTip:\u001b(B\u001b[m Our most capable model yet. GPT-5.6 Sol can tackle complex code changes, dig into research,\u001b[K\r\n  produce polished documents, and take on your most ambitious work. Sol is highly capable at lower\u001b[K\r\n  reasoning efforts—try starting lower, then turn it up for harder jobs.\u001b[K\r\n\u001b[K\r\n\u001b[K\u001b[1m\r\n›\u001b(B\u001b[m\u001b[1X\u001b[2m\u001b[CUse /skills to list available skills\u001b(B\u001b[m\u001b[K\r\n\u001b[K\u001b[20;2H\u001b[1K\u001b[38;5;223m\u001b[Cgpt-5.6-sol default\u001b[39m\u001b[2m · \u001b(B\u001b[m\u001b[38;5;151m~/default/claudeman-predictive/tmp/codexrec-work-bw9Uto\u001b[39m\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\u001b[?12l\u001b[?25h\u001b[18;3H"}
+{"keyAt":true,"data":"/"}
+{"delayMs":207,"data":"\u001b[17;1H\u001b[J\u001b[A\u001b[K"}
+{"delayMs":1,"data":"\u001b[2B\u001b[1m›\u001b[C\u001b(B\u001b[m/\u001b[20;3H\u001b[36m\u001b[1m/model         choose what model and reasoning effort to use\u001b[21;3H\u001b(B\u001b[m/fast\u001b[10C\u001b[2m1.5x speed, increased usage\u001b[22;3H\u001b(B\u001b[m/ide\u001b[11C\u001b[2minclude current selection, open files, and other context from your IDE\u001b[23;3H\u001b(B\u001b[m/permissions\u001b[3C\u001b[2mchoose what Codex is allowed to do\u001b[24;3H\u001b(B\u001b[m/keymap\u001b[8C\u001b[2mremap TUI shortcuts\u001b[25;3H\u001b(B\u001b[m/vim\u001b[11C\u001b[2mtoggle Vim mode for the composer\u001b[26;3H\u001b(B\u001b[m/experimental\u001b[2C\u001b[2mtoggle experimental features\u001b[27;3H\u001b(B\u001b[m/approve\u001b[7C\u001b[2mapprove one retry of a recent auto-review denial\u001b[18;4H\u001b(B\u001b[m"}
+{"keyAt":true,"data":"m"}
+{"delayMs":398,"data":"\u001b[17;1H\u001b[J\u001b[A\u001b[K"}
+{"delayMs":1,"data":"\u001b[2B\u001b[1m›\u001b[C\u001b(B\u001b[m/m\u001b[20;3H\u001b[36m\u001b[1m/model     choose what model and reasoning effort to use\u001b[21;3H\u001b(B\u001b[m/\u001b[1mm\u001b(B\u001b[memories\u001b[2C\u001b[2mconfigure memory use and generation\u001b[22;3H\u001b(B\u001b[m/\u001b[1mm\u001b(B\u001b[mention\u001b[3C\u001b[2mmention a file\u001b[23;3H\u001b(B\u001b[m/\u001b[1mm\u001b(B\u001b[mcp\u001b[7C\u001b[2mlist configured MCP tools; use /mcp verbose for details\u001b[18;5H\u001b(B\u001b[m"}
+{"keyAt":true,"data":"o"}
+{"delayMs":148,"data":"\u001b[17;1H\u001b[J\u001b[A\u001b[K"}
+{"delayMs":0,"data":"\u001b[2B\u001b[1m›\u001b[C\u001b(B\u001b[m/mo\u001b[20;3H\u001b[36m\u001b[1m/model  choose what model and reasoning effort to use\u001b[18;6H\u001b(B\u001b[m"}
+{"keyAt":true,"data":"\u001b"}

packages/xterm-zerolag-input/test/fixtures/codex/streaming-burst.jsonl

@@ -0,0 +1,233 @@
+{"scenario":"streaming-burst","cols":100,"rows":30,"codexVersion":"codex-cli 0.147.0","recordedAt":"2026-08-09T01:51:03.828Z"}
+{"delayMs":0,"data":"\u001b[22;0;0t\u001b[?1h\u001b=\u001b[H\u001b[2J\u001b[?12l\u001b[?25h\u001b[?2004h\u001b(B\u001b[m\u001b[?12l\u001b[?25h\u001b[1;1H\u001b[1;30r\u001b[c\u001b[>c\u001b[>q\u001b]10;?\u001b\\\u001b]11;?\u001b\\\u001b[1;1H"}
+{"delayMs":0,"data":"\u001b[?25l\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\u001b[?12l\u001b[?25h\u001b[H"}
+{"delayMs":0,"data":"\u001b(B\u001b[m\u001b[?12l\u001b[?25h\u001b[1;1H\u001b[1;30r\u001b[1;1H"}
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+{"delayMs":39,"data":"\u001b[32m\u001b[1markon@tnode\u001b(B\u001b[m:\u001b[34m\u001b[1m~/default/claudeman-predictive/tmp/codexrec-work-ruT16A\u001b(B\u001b[m$ "}
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+{"delayMs":439,"data":"\u001b[?25l\u001b[?12l\u001b[?25h"}
+{"delayMs":184,"data":"\u001b[?25l\u001b[?12l\u001b[?25h"}
+{"delayMs":9,"data":"\r\n\u001b[J\u001b[A\u001b[K\u001b[2;30r\u001b[2;1H\u001bM\u001bM\u001bM\u001b[1;30r\u001b[2;1H\u001b[33m⚠ Codex could not find bubblewrap on PATH. Install bubblewrap with your OS package manager. See the\r\n\u001b[39m  \u001b[33msandbox prerequisites: https://developers.openai.com/codex/concepts/sandboxing#prerequisites.\r\n\u001b(B\u001b[m  \u001b[33mCodex will use the bundled bubblewrap in the meantime.\u001b[6;1H\u001b[39m\u001b[2m╭─────────────────────────────────────────────────╮\r\n│ >_ \u001b(B\u001b[m\u001b[1mOpenAI Codex\u001b(B\u001b[m\u001b[2m (v0.147.0)                      │\r\n│                                                 │\r\n│ model:     \u001b[3mloading\u001b(B\u001b[m\u001b[2m   \u001b(B\u001b[m\u001b[36m/model\u001b[39m\u001b[2m to change           │\r\n│ directory: \u001b(B\u001b[m~/default/…/tmp/codexrec-work-ruT16A\u001b[2m │\r\n╰─────────────────────────────────────────────────╯\u001b[14;1H\u001b(B\u001b[m\u001b[1m›\u001b[C\u001b(B\u001b[m\u001b[2mUse /skills to list available skills\u001b[16;3H\u001b(B\u001b[m\u001b[38;5;223mgpt-5.6-sol default\u001b[39m\u001b[2m · \u001b(B\u001b[m\u001b[38;5;151m~/default/claudeman-predictive/tmp/codexrec-work-ruT16A\u001b[14;3H\u001b(B\u001b[m"}
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+{"delayMs":21,"data":"\u001b[5;30r\u001b[5;1H\u001bM\u001bM\u001bM\u001bM\u001bM\u001bM\u001bM\u001bM\u001bM\u001bM\u001bM\r\n\u001b[2m╭─────────────────────────────────────────────────╮\u001b[1;30r\u001b[7;1H\u001b(B\u001b[m\u001b[2m│ >_ \u001b(B\u001b[m\u001b[1mOpenAI Codex\u001b(B\u001b[m\u001b[2m (v0.147.0)                      │\r\n│                                                 │\r\n│ model:     \u001b(B\u001b[mgpt-5.6-sol\u001b[2m   \u001b(B\u001b[m\u001b[36m/model\u001b[39m\u001b[2m to change       │\r\n│ directory: \u001b(B\u001b[m~/default/…/tmp/codexrec-work-ruT16A\u001b[2m │\r\n╰─────────────────────────────────────────────────╯\u001b[13;1H\u001b(B\u001b[m  \u001b[1mTip:\u001b(B\u001b[m Our most capable model yet. GPT-5.6 Sol can tackle complex code changes, dig into research,\r\n  produce polished documents, and take on your most ambitious work. Sol is highly capable at lower\r\n"}
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packages/xterm-zerolag-input/test/fixtures/codex/streaming-real.jsonl

@@ -0,0 +1,154 @@
+{"scenario":"streaming-real","cols":100,"rows":30,"codexVersion":"codex-cli 0.147.0","recordedAt":"2026-08-09T09:31:57.351Z"}
+{"delayMs":0,"data":"\u001b[22;0;0t\u001b[?1h\u001b=\u001b[H\u001b[2J\u001b[?12l\u001b[?25h\u001b[?2004h\u001b(B\u001b[m\u001b[?12l\u001b[?25h\u001b[1;1H\u001b[1;30r\u001b[c\u001b[>c\u001b[>q\u001b]10;?\u001b\\\u001b]11;?\u001b\\\u001b[1;1H"}
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packages/xterm-zerolag-input/test/fixtures/codex/trust-modal.jsonl

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+{"delayMs":0,"data":"  reasoning efforts—try starting lower, then turn it up for harder jobs.\u001b[17;37H\u001b[K\u001b[19;80H\u001b[K\u001b[17;3H"}
+{"delayMs":1,"data":"\u001b[34C\u001b[K\u001b[19;80H\u001b[K\u001b[17;3H"}

packages/xterm-zerolag-input/test/fixtures/codex/type-hello.jsonl

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+{"scenario":"type-hello","cols":100,"rows":30,"codexVersion":"codex-cli 0.147.0","recordedAt":"2026-08-09T01:50:33.854Z"}
+{"delayMs":0,"data":"\u001b[22;0;0t\u001b[?1h\u001b=\u001b[H\u001b[2J\u001b[?12l\u001b[?25h\u001b[?2004h\u001b(B\u001b[m\u001b[?12l\u001b[?25h\u001b[1;1H\u001b[1;30r\u001b[c\u001b[>c\u001b[>q\u001b]10;?\u001b\\\u001b]11;?\u001b\\\u001b[1;1H"}
+{"delayMs":1,"data":"\u001b[?25l\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\u001b[?12l\u001b[?25h\u001b[H\u001b(B\u001b[m\u001b[?12l\u001b[?25h\u001b[1;1H\u001b[1;30r\u001b[1;1H\u001b[?25l\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\u001b[?12l\u001b[?25h\u001b[H"}
+{"delayMs":32,"data":"\u001b[32m\u001b[1markon@tnode\u001b(B\u001b[m:\u001b[34m\u001b[1m~/default/claudeman-predictive/tmp/codexrec-work-tXbGez\u001b(B\u001b[m$ "}
+{"delayMs":651,"data":"exec codex\r\n"}
+{"delayMs":403,"data":"\u001b[?25l\u001b[?12l\u001b[?25h"}
+{"delayMs":189,"data":"\u001b[?25l\u001b[?12l\u001b[?25h"}
+{"delayMs":7,"data":"\r\n\u001b[J\u001b[A\u001b[K"}
+{"delayMs":4,"data":"\u001b[2;30r\u001b[2;1H\u001bM\u001bM\u001bM\u001b[1;30r\u001b[2;1H\u001b[33m⚠ Codex could not find bubblewrap on PATH. Install bubblewrap with your OS package manager. See the\r\n\u001b[39m  \u001b[33msandbox prerequisites: https://developers.openai.com/codex/concepts/sandboxing#prerequisites.\r\n\u001b[39m  \u001b[33mCodex will use the bundled bubblewrap in the meantime.\u001b[6;1H\u001b[39m\u001b[2m╭─────────────────────────────────────────────────╮\r\n│ >_ \u001b(B\u001b[m\u001b[1mOpenAI Codex\u001b(B\u001b[m\u001b[2m (v0.147.0)                      │\r\n│                                                 │\r\n│ model:     \u001b[3mloading\u001b(B\u001b[m\u001b[2m   \u001b(B\u001b[m\u001b[36m/model\u001b[39m\u001b[2m to change           │\r\n│ directory: \u001b(B\u001b[m~/default/…/tmp/codexrec-work-tXbGez\u001b[2m │\r\n╰─────────────────────────────────────────────────╯\u001b[14;1H\u001b(B\u001b[m\u001b[1m›\u001b[C\u001b(B\u001b[m\u001b[2mImprove documentation in @filename\u001b[16;3H\u001b(B\u001b[m\u001b[38;5;223mgpt-5.6-sol default\u001b[39m\u001b[2m · \u001b(B\u001b[m\u001b[38;5;151m~/default/claudeman-predictive/tmp/codexrec-work-tXbGez\u001b[14;3H\u001b(B\u001b[m"}
+{"delayMs":6,"data":"\u001b[6;52H\u001b[K\n\u001b[K\n\u001b[K\n\u001b[K\n\u001b[K\n\u001b[K\u001b[14;37H\u001b[K\u001b[16;80H\u001b[K\u001b[14;3H"}
+{"delayMs":25,"data":"\u001b[6;52H\u001b[K\n\u001b[K\n\u001b[K\n\u001b[K\n\u001b[K\n\u001b[K\u001b[14;37H\u001b[K\u001b[16;80H\u001b[K\u001b[14;3H"}
+{"delayMs":8,"data":"\u001b[6;52H\u001b[K\n\u001b[K\n\u001b[K\n\u001b[K\n\u001b[K\n\u001b[K\u001b[14;37H\u001b[K\u001b[16;80H\u001b[K\u001b[14;3H"}
+{"delayMs":185,"data":"\u001b[6;1H\u001b[J\u001b[A\u001b[K"}
+{"delayMs":0,"data":"\u001b[5;30r\u001b[5;1H\u001bM\u001bM\u001bM\u001bM\u001bM\u001bM\u001bM\u001bM\u001bM\u001bM\u001bM\u001b[1;30r\u001b[5;1H"}
+{"delayMs":0,"data":"\r\n\u001b[2m╭─────────────────────────────────────────────────╮\r\n\u001b(B\u001b[m"}
+{"delayMs":0,"data":"\u001b[2m│ >_ \u001b(B\u001b[m\u001b[1mOpenAI Codex\u001b(B\u001b[m\u001b[2m (v0.147.0)                      │\r\n│                                                 │\r\n│ model:     \u001b(B\u001b[mgpt-5.6-sol\u001b[2m   \u001b(B\u001b[m\u001b[36m/model\u001b[39m\u001b[2m to change       │\r\n\u001b(B\u001b[m"}
+{"delayMs":0,"data":"\u001b[2m│ directory: \u001b(B\u001b[m~/default/…/tmp/codexrec-work-tXbGez\u001b[2m │\r\n╰─────────────────────────────────────────────────╯\u001b[13;1H\u001b(B\u001b[m  \u001b[1mTip:\u001b(B\u001b[m Our most capable model yet. GPT-5.6 Sol can tackle complex code changes, dig into research,\r\n"}
+{"delayMs":0,"data":"  produce polished documents, and take on your most ambitious work. Sol is highly capable at lower\r\n"}
+{"delayMs":0,"data":"  reasoning efforts—try starting lower, then turn it up for harder jobs.\u001b[18;1H\u001b[1m›\u001b[C\u001b(B\u001b[m\u001b[2mImprove documentation in @filename\u001b[20;3H\u001b(B\u001b[m\u001b[38;5;223mgpt-5.6-sol default\u001b[39m\u001b[2m · \u001b(B\u001b[m\u001b[38;5;151m~/default/claudeman-predictive/tmp/codexrec-work-tXbGez\u001b[18;3H\u001b(B\u001b[m"}
+{"delayMs":0,"data":"\u001b[34C\u001b[K\u001b[20;80H\u001b[K\u001b[18;3H"}
+{"delayMs":0,"data":"\u001b[34C\u001b[K\u001b[20;80H\u001b[K\u001b[18;3H"}
+{"delayMs":3484,"data":"\u001b[?7727h\u001b(B\u001b[m\u001b[?12l\u001b[?25h\u001b[1;1H\u001b[1;30r\u001b[18;3H"}
+{"delayMs":0,"data":"\u001b[?25l\u001b[32m\u001b[1m\u001b[Harkon@tnode\u001b(B\u001b[m:\u001b[34m\u001b[1m~/default/claudeman-predictive/tmp/codexrec-work-tXbGez\u001b(B\u001b[m$ exec codex\u001b[K\u001b[33m\r\n⚠ Codex could not find bubblewrap on PATH. Install bubblewrap with your OS package manager. See the\u001b[39m\u001b[K\r\n  \u001b[33msandbox prerequisites: https://developers.openai.com/codex/concepts/sandboxing#prerequisites.\u001b[39m\u001b[K\r\n  \u001b[33mCodex will use the bundled bubblewrap in the meantime.\u001b[39m\u001b[K\r\n\u001b[K\u001b[2m\r\n╭─────────────────────────────────────────────────╮\u001b(B\u001b[m\u001b[K\u001b[2m\r\n│ >_ \u001b(B\u001b[m\u001b[1mOpenAI Codex\u001b(B\u001b[m\u001b[2m (v0.147.0)                      │\u001b(B\u001b[m\u001b[K\u001b[2m\r\n│                                                 │\u001b(B\u001b[m\u001b[K\u001b[2m\r\n│ model:     \u001b(B\u001b[mgpt-5.6-sol\u001b[2m   \u001b(B\u001b[m\u001b[36m/model\u001b[39m\u001b[2m to change       │\u001b(B\u001b[m\u001b[K\u001b[2m\r\n│ directory: \u001b(B\u001b[m~/default/…/tmp/codexrec-work-tXbGez\u001b[2m │\u001b(B\u001b[m\u001b[K\u001b[2m\r\n╰─────────────────────────────────────────────────╯\u001b(B\u001b[m\u001b[K\r\n\u001b[K\r\n  \u001b[1mTip:\u001b(B\u001b[m Our most capable model yet. GPT-5.6 Sol can tackle complex code changes, dig into research,\u001b[K\r\n  produce polished documents, and take on your most ambitious work. Sol is highly capable at lower\u001b[K\r\n  reasoning efforts—try starting lower, then turn it up for harder jobs.\u001b[K\r\n\u001b[K\r\n\u001b[K\u001b[1m\r\n›\u001b(B\u001b[m\u001b[1X\u001b[2m\u001b[CImprove documentation in @filename\u001b(B\u001b[m\u001b[K\r\n\u001b[K\u001b[20;2H\u001b[1K\u001b[38;5;223m\u001b[Cgpt-5.6-sol default\u001b[39m\u001b[2m · \u001b(B\u001b[m\u001b[38;5;151m~/default/claudeman-predictive/tmp/codexrec-work-tXbGez\u001b[39m\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\u001b[?12l\u001b[?25h\u001b[18;3H"}
+{"keyAt":true,"data":"h"}
+{"delayMs":208,"data":"h\u001b[K\u001b[20;80H\u001b[K\u001b[18;4H"}
+{"keyAt":true,"data":"e"}
+{"delayMs":93,"data":"e\u001b[K\u001b[20;80H\u001b[K\u001b[18;5H"}
+{"keyAt":true,"data":"l"}
+{"delayMs":89,"data":"l\u001b[K\u001b[20;80H\u001b[K\u001b[18;6H"}
+{"keyAt":true,"data":"l"}
+{"delayMs":92,"data":"l\u001b[K\u001b[20;80H\u001b[K\u001b[18;7H"}
+{"keyAt":true,"data":"o"}
+{"delayMs":90,"data":"o\u001b[K\u001b[20;80H\u001b[K\u001b[18;8H"}

packages/xterm-zerolag-input/test/fixtures/codex/wrap.jsonl

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+{"scenario":"wrap","cols":100,"rows":30,"codexVersion":"codex-cli 0.147.0","recordedAt":"2026-08-09T01:50:52.462Z"}
+{"delayMs":0,"data":"\u001b[22;0;0t\u001b[?1h\u001b=\u001b[H\u001b[2J\u001b[?12l\u001b[?25h\u001b[?2004h\u001b(B\u001b[m\u001b[?12l\u001b[?25h\u001b[1;1H\u001b[1;30r\u001b[c\u001b[>c\u001b[>q\u001b]10;?\u001b\\\u001b]11;?\u001b\\\u001b[1;1H"}
+{"delayMs":0,"data":"\u001b[?25l\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\u001b[?12l\u001b[?25h\u001b[H"}
+{"delayMs":0,"data":"\u001b(B\u001b[m\u001b[?12l\u001b[?25h\u001b[1;1H\u001b[1;30r\u001b[1;1H"}
+{"delayMs":0,"data":"\u001b[?25l\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\r\n\u001b[K\u001b[?12l\u001b[?25h\u001b[H"}
+{"delayMs":32,"data":"\u001b[32m\u001b[1markon@tnode\u001b(B\u001b[m:\u001b[34m\u001b[1m~/default/claudeman-predictive/tmp/codexrec-work-VGU83J\u001b(B\u001b[m$ "}
+{"delayMs":650,"data":"exec codex\r\n"}
+{"delayMs":437,"data":"\u001b[?25l\u001b[?12l\u001b[?25h"}
+{"delayMs":181,"data":"\u001b[?25l\u001b[?12l\u001b[?25h"}
+{"delayMs":4,"data":"\r\n\u001b[J\u001b[A\u001b[K"}
+{"delayMs":0,"data":"\u001b[2;30r\u001b[2;1H\u001bM\u001bM\u001bM\u001b[1;30r\u001b[2;1H"}
+{"delayMs":0,"data":"\u001b[33m⚠ Codex could not find bubblewrap on PATH. Install bubblewrap with your OS package manager. See the\r\n\u001b[39m  \u001b[33msandbox prerequisites: https://developers.openai.com/codex/concepts/sandboxing#prerequisites.\r\n\u001b(B\u001b[m"}
+{"delayMs":1,"data":"  \u001b[33mCodex will use the bundled bubblewrap in the meantime.\u001b[6;1H\u001b[39m\u001b[2m╭─────────────────────────────────────────────────╮\r\n│ >_ \u001b(B\u001b[m\u001b[1mOpenAI Codex\u001b(B\u001b[m\u001b[2m (v0.147.0)                      │\r\n│                                                 │\r\n│ model:     \u001b[3mloading\u001b(B\u001b[m\u001b[2m   \u001b(B\u001b[m\u001b[36m/model\u001b[39m\u001b[2m to change           │\r\n│ directory: \u001b(B\u001b[m~/default/…/tmp/codexrec-work-VGU83J\u001b[2m │\r\n╰─────────────────────────────────────────────────╯\u001b[14;1H\u001b(B\u001b[m\u001b[1m›\u001b[C\u001b(B\u001b[m\u001b[2mWrite tests for @filename\u001b[16;3H\u001b(B\u001b[m\u001b[38;5;223mgpt-5.6-sol default\u001b[39m\u001b[2m · \u001b(B\u001b[m\u001b[38;5;151m~/default/claudeman-predictive/tmp/codexrec-work-VGU83J\u001b[14;3H\u001b(B\u001b[m"}
+{"delayMs":6,"data":"\u001b[6;52H\u001b[K\n\u001b[K\n\u001b[K\n\u001b[K\n\u001b[K\n\u001b[K\u001b[14;28H\u001b[K\u001b[16;80H\u001b[K\u001b[14;3H"}
+{"delayMs":19,"data":"\u001b[6;52H\u001b[K\n\u001b[K\n\u001b[K\n\u001b[K\n\u001b[K\n\u001b[K\u001b[14;28H\u001b[K\u001b[16;80H\u001b[K\u001b[14;3H"}
+{"delayMs":6,"data":"\u001b[6;52H\u001b[K\n\u001b[K\n\u001b[K\n\u001b[K\n\u001b[K\n\u001b[K\u001b[14;28H\u001b[K\u001b[16;80H\u001b[K\u001b[14;3H"}
+{"delayMs":160,"data":"\u001b[6;1H\u001b[J\u001b[A\u001b[K"}
+{"delayMs":0,"data":"\u001b[5;30r\u001b[5;1H\u001bM\u001bM\u001bM\u001bM\u001bM\u001bM\u001bM\u001bM\u001bM\u001bM\u001bM\u001b[1;30r\u001b[5;1H"}
+{"delayMs":0,"data":"\r\n\u001b[2m╭─────────────────────────────────────────────────╮\r\n│ >_ \u001b(B\u001b[m\u001b[1mOpenAI Codex\u001b(B\u001b[m\u001b[2m (v0.147.0)                      │\r\n│                                                 │\r\n\u001b(B\u001b[m"}
+{"delayMs":0,"data":"\u001b[2m│ model:     \u001b(B\u001b[mgpt-5.6-sol\u001b[2m   \u001b(B\u001b[m\u001b[36m/model\u001b[39m\u001b[2m to change       │\r\n│ directory: \u001b(B\u001b[m~/default/…/tmp/codexrec-work-VGU83J\u001b[2m │\r\n╰─────────────────────────────────────────────────╯\u001b[13;1H\u001b(B\u001b[m  \u001b[1mTip:\u001b(B\u001b[m Our most capable model yet. GPT-5.6 Sol can tackle complex code changes, dig into research,\r\n  produce polished documents, and take on your most ambitious work. Sol is highly capable at lower\r\n"}
+{"delayMs":0,"data":"  reasoning efforts—try starting lower, then turn it up for harder jobs.\u001b[18;1H\u001b[1m›\u001b[C\u001b(B\u001b[m\u001b[2mWrite tests for @filename\u001b[20;3H\u001b(B\u001b[m\u001b[38;5;223mgpt-5.6-sol default\u001b[39m\u001b[2m · \u001b(B\u001b[m\u001b[38;5;151m~/default/claudeman-predictive/tmp/codexrec-work-VGU83J\u001b[18;3H\u001b(B\u001b[m"}
+{"delayMs":18,"data":"\u001b[25C\u001b[K\u001b[20;80H\u001b[K\u001b[18;3H"}
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packages/xterm-zerolag-input/test/helpers.ts

@@ -3,129 +3,204 @@
  *
  * Creates a minimal Terminal-like object that satisfies the addon's
  * requirements without needing a real xterm.js instance or DOM renderer.
+ *
+ * PredictiveEchoAddon additions (all ADDITIVE, existing tests unchanged):
+ * mutable cursor via setCursor(), wide-char-aware getCell() on mock lines,
+ * onWriteParsed/onResize emitters with fire* triggers, and opt-outs for
+ * getCell support and the emitters (getCellSupport / emitters options).
  */
+import { charCellWidth } from '../src/overlay-renderer.js';
 
 interface MockLine {
-    translateToString(_trimRight?: boolean): string;
+  translateToString(_trimRight?: boolean): string;
+  getCell?(x: number): { getChars(): string; getWidth(): number } | undefined;
 }
 
 interface MockBufferOptions {
-    lines: string[];
-    viewportY?: number;
-    baseY?: number;
-    cursorX?: number;
-    cursorY?: number;
+  lines: string[];
+  viewportY?: number;
+  baseY?: number;
+  cursorX?: number;
+  cursorY?: number;
 }
 
 interface MockTerminalOptions {
-    buffer?: MockBufferOptions;
-    cols?: number;
-    rows?: number;
-    fontFamily?: string;
-    fontSize?: number;
-    fontWeight?: string | number;
-    theme?: {
-        background?: string;
-        foreground?: string;
-        cursor?: string;
-    };
-    cellWidth?: number;
-    cellHeight?: number;
-    /** Device-pixel char top offset (for charTop calculation). Default: 0 */
-    deviceCharTop?: number;
-    /** Device-pixel char height (for charHeight calculation). Default: cellHeight * dpr */
-    deviceCharHeight?: number;
+  buffer?: MockBufferOptions;
+  cols?: number;
+  rows?: number;
+  fontFamily?: string;
+  fontSize?: number;
+  fontWeight?: string | number;
+  theme?: {
+    background?: string;
+    foreground?: string;
+    cursor?: string;
+  };
+  cellWidth?: number;
+  cellHeight?: number;
+  /** Device-pixel char top offset (for charTop calculation). Default: 0 */
+  deviceCharTop?: number;
+  /** Device-pixel char height (for charHeight calculation). Default: cellHeight * dpr */
+  deviceCharHeight?: number;
+  /** Provide getCell() on mock lines (PredictiveEchoAddon). Default: true */
+  getCellSupport?: boolean;
+  /** Provide onWriteParsed/onResize emitters (PredictiveEchoAddon). Default: true */
+  emitters?: boolean;
+}
+
+/** Column-indexed cell access over a plain string, wide-char aware. */
+function cellAt(text: string, col: number): { getChars(): string; getWidth(): number } {
+  let c = 0;
+  for (const ch of text) {
+    const w = charCellWidth(null, ch);
+    if (col === c) return { getChars: () => ch, getWidth: () => w };
+    if (w === 2 && col === c + 1) return { getChars: () => '', getWidth: () => 0 };
+    c += w;
+  }
+  return { getChars: () => '', getWidth: () => 1 };
 }
 
 export function createMockTerminal(opts: MockTerminalOptions = {}) {
-    const bufOpts = opts.buffer ?? { lines: ['$ '] };
-    const lines = bufOpts.lines;
-    const viewportY = bufOpts.viewportY ?? 0;
-    const baseY = bufOpts.baseY ?? viewportY;
-    const cols = opts.cols ?? 80;
-    const rows = opts.rows ?? Math.max(lines.length, 24);
-    const cellW = opts.cellWidth ?? 8.4;
-    const cellH = opts.cellHeight ?? 17;
+  const bufOpts = opts.buffer ?? { lines: ['$ '] };
+  const viewportY = bufOpts.viewportY ?? 0;
+  const baseY = bufOpts.baseY ?? viewportY;
+  const cols = opts.cols ?? 80;
+  const rows = opts.rows ?? Math.max(bufOpts.lines.length, 24);
+  const cellW = opts.cellWidth ?? 8.4;
+  const cellH = opts.cellHeight ?? 17;
+  const getCellSupport = opts.getCellSupport ?? true;
+  const emitters = opts.emitters ?? true;
 
-    const mockLines: MockLine[] = lines.map((text) => ({
-        translateToString: () => text,
-    }));
-
-    // Create minimal DOM structure
-    const element = document.createElement('div');
-    element.className = 'terminal xterm';
-
-    const viewport = document.createElement('div');
-    viewport.className = 'xterm-viewport';
-
-    const screen = document.createElement('div');
-    screen.className = 'xterm-screen';
-    screen.style.position = 'relative';
-
-    const xtermRows = document.createElement('div');
-    xtermRows.className = 'xterm-rows';
-
-    element.appendChild(viewport);
-    element.appendChild(screen);
-    screen.appendChild(xtermRows);
-
-    // Append to document so getComputedStyle works
-    document.body.appendChild(element);
-
-    const terminal = {
-        element,
-        cols,
-        rows,
-        options: {
-            fontFamily: opts.fontFamily ?? 'monospace',
-            fontSize: opts.fontSize ?? 14,
-            fontWeight: opts.fontWeight ?? 'normal',
-            theme: opts.theme ?? {},
-        },
-        buffer: {
-            active: {
-                viewportY,
-                baseY,
-                cursorX: bufOpts.cursorX ?? 0,
-                cursorY: bufOpts.cursorY ?? 0,
-                getLine: (absRow: number): MockLine | undefined => {
-                    return mockLines[absRow - viewportY];
-                },
-            },
-        },
-        _core: {
-            _renderService: {
-                dimensions: {
-                    css: {
-                        cell: { width: cellW, height: cellH },
-                    },
-                    device: {
-                        char: {
-                            top: opts.deviceCharTop ?? 0,
-                            height: opts.deviceCharHeight ?? cellH,
-                        },
-                    },
-                },
-            },
-        },
-        // Simulate loadAddon
-        loadAddon(addon: { activate: (t: unknown) => void }) {
-            addon.activate(this);
-        },
+  const makeLine = (text: string): { line: MockLine; set(t: string): void } => {
+    let current = text;
+    const line: MockLine = {
+      translateToString: () => current,
     };
+    if (getCellSupport) {
+      line.getCell = (x: number) => cellAt(current, x);
+    }
+    return { line, set: (t: string) => (current = t) };
+  };
 
-    return {
-        terminal,
-        /** Update buffer lines for subsequent calls */
-        setLines(newLines: string[]) {
-            mockLines.length = 0;
-            for (const text of newLines) {
-                mockLines.push({ translateToString: () => text });
-            }
+  let mockLines = bufOpts.lines.map(makeLine);
+
+  // Create minimal DOM structure
+  const element = document.createElement('div');
+  element.className = 'terminal xterm';
+
+  const viewport = document.createElement('div');
+  viewport.className = 'xterm-viewport';
+
+  const screen = document.createElement('div');
+  screen.className = 'xterm-screen';
+  screen.style.position = 'relative';
+
+  const xtermRows = document.createElement('div');
+  xtermRows.className = 'xterm-rows';
+
+  element.appendChild(viewport);
+  element.appendChild(screen);
+  screen.appendChild(xtermRows);
+
+  // Append to document so getComputedStyle works
+  document.body.appendChild(element);
+
+  const writeParsedCbs = new Set<() => void>();
+  const resizeCbs = new Set<(s: { cols: number; rows: number }) => void>();
+
+  const terminal = {
+    element,
+    cols,
+    rows,
+    options: {
+      fontFamily: opts.fontFamily ?? 'monospace',
+      fontSize: opts.fontSize ?? 14,
+      fontWeight: opts.fontWeight ?? 'normal',
+      theme: opts.theme ?? {},
+    },
+    buffer: {
+      active: {
+        viewportY,
+        baseY,
+        cursorX: bufOpts.cursorX ?? 0,
+        cursorY: bufOpts.cursorY ?? 0,
+        getLine: (absRow: number): MockLine | undefined => {
+          return mockLines[absRow - viewportY]?.line;
         },
-        /** Clean up DOM */
-        cleanup() {
-            element.remove();
+      },
+    },
+    _core: {
+      _renderService: {
+        dimensions: {
+          css: {
+            cell: { width: cellW, height: cellH },
+          },
+          device: {
+            char: {
+              top: opts.deviceCharTop ?? 0,
+              height: opts.deviceCharHeight ?? cellH,
+            },
+          },
         },
-    };
+      },
+    },
+    ...(emitters
+      ? {
+          onWriteParsed(cb: () => void) {
+            writeParsedCbs.add(cb);
+            return { dispose: () => writeParsedCbs.delete(cb) };
+          },
+          onResize(cb: (s: { cols: number; rows: number }) => void) {
+            resizeCbs.add(cb);
+            return { dispose: () => resizeCbs.delete(cb) };
+          },
+        }
+      : {}),
+    // Simulate loadAddon
+    loadAddon(addon: { activate: (t: unknown) => void }) {
+      addon.activate(this);
+    },
+  };
+
+  return {
+    terminal,
+    /** Update buffer lines for subsequent calls */
+    setLines(newLines: string[]) {
+      mockLines = newLines.map(makeLine);
+    },
+    /** Update one line's text in place (PredictiveEchoAddon echo simulation) */
+    setLine(index: number, text: string) {
+      mockLines[index]?.set(text);
+    },
+    /** Move the mock cursor (PredictiveEchoAddon) */
+    setCursor(x: number, y: number) {
+      terminal.buffer.active.cursorX = x;
+      terminal.buffer.active.cursorY = y;
+    },
+    /** Set scroll state (viewportY / baseY) */
+    setScroll(newViewportY: number, newBaseY: number) {
+      terminal.buffer.active.viewportY = newViewportY;
+      terminal.buffer.active.baseY = newBaseY;
+    },
+    /** Fire the onWriteParsed emitter (PredictiveEchoAddon reconcile trigger) */
+    fireWriteParsed() {
+      for (const cb of [...writeParsedCbs]) cb();
+    },
+    /** Fire the onResize emitter */
+    fireResize(newCols = cols, newRows = rows) {
+      for (const cb of [...resizeCbs]) cb({ cols: newCols, rows: newRows });
+    },
+    /** Number of live onWriteParsed listeners (dispose assertions) */
+    writeParsedListenerCount() {
+      return writeParsedCbs.size;
+    },
+    /** Number of live onResize listeners (dispose assertions) */
+    resizeListenerCount() {
+      return resizeCbs.size;
+    },
+    /** Clean up DOM */
+    cleanup() {
+      element.remove();
+    },
+  };
 }

packages/xterm-zerolag-input/test/prediction-renderer.test.ts

@@ -0,0 +1,135 @@
+/**
+ * @vitest-environment jsdom
+ *
+ * prediction-renderer unit tests: span geometry math, seam-cover height,
+ * ligature suppression, incremental add/remove keyed by seq, and geometry
+ * stability under a non-1 devicePixelRatio (all dims are CSS px).
+ */
+import { afterEach, describe, expect, it, vi } from 'vitest';
+import { addPredictionSpan, clearAllSpans, removePredictionSpan } from '../src/prediction-renderer.js';
+import type { CellDimensions, FontStyle } from '../src/types.js';
+
+const dims: CellDimensions = { width: 9, height: 18, charTop: 1, charHeight: 16 };
+const font: FontStyle = {
+  fontFamily: 'monospace',
+  fontSize: '14px',
+  fontWeight: 'normal',
+  color: '#e0e0e0',
+  backgroundColor: '#101010',
+  letterSpacing: '0.5px',
+};
+
+function makeContainer() {
+  const el = document.createElement('div');
+  document.body.appendChild(el);
+  return el;
+}
+
+function span(container: HTMLElement, map: Map<number, HTMLSpanElement>, over: Record<string, unknown> = {}) {
+  addPredictionSpan(container, map, {
+    seq: 1,
+    row: 3,
+    col: 5,
+    char: 'x',
+    width: 1,
+    dims,
+    font,
+    underline: false,
+    ...over,
+  } as never);
+  return map.get((over.seq as number) ?? 1)!;
+}
+
+describe('prediction-renderer', () => {
+  afterEach(() => {
+    document.body.innerHTML = '';
+    vi.unstubAllGlobals();
+  });
+
+  it('positions a width-1 span on the exact cell grid', () => {
+    const map = new Map<number, HTMLSpanElement>();
+    const s = span(makeContainer(), map);
+    expect(s.style.left).toBe(`${5 * 9}px`);
+    expect(s.style.top).toBe(`${3 * 18}px`);
+    expect(s.style.width).toBe(`${9}px`);
+    expect(s.textContent).toBe('x');
+  });
+
+  it('positions a width-2 span across two cells', () => {
+    const map = new Map<number, HTMLSpanElement>();
+    const s = span(makeContainer(), map, { char: '你', width: 2 });
+    expect(s.style.width).toBe(`${2 * 9}px`);
+  });
+
+  it('covers the row seam: height is cellH+1 with line-height cellH', () => {
+    const map = new Map<number, HTMLSpanElement>();
+    const s = span(makeContainer(), map);
+    expect(s.style.height).toBe(`${18 + 1}px`);
+    expect(s.style.lineHeight).toBe('18px');
+  });
+
+  it('disables ligatures and pointer events, applies font + letter-spacing', () => {
+    const map = new Map<number, HTMLSpanElement>();
+    const s = span(makeContainer(), map);
+    expect(s.style.cssText).toContain("'liga' 0");
+    expect(s.style.cssText).toContain("'calt' 0");
+    expect(s.style.pointerEvents).toBe('none');
+    expect(s.style.fontFamily).toBe('monospace');
+    expect(s.style.letterSpacing).toBe('0.5px');
+    expect(s.style.textAlign).toBe('center');
+  });
+
+  it('paints an opaque background over only its own cells', () => {
+    const map = new Map<number, HTMLSpanElement>();
+    const s = span(makeContainer(), map);
+    expect(['#101010', 'rgb(16, 16, 16)']).toContain(s.style.backgroundColor);
+    // Background is bounded by the span's own width, never a full row
+    expect(s.style.width).toBe('9px');
+  });
+
+  it('underline renders only when requested', () => {
+    const map = new Map<number, HTMLSpanElement>();
+    const container = makeContainer();
+    const plain = span(container, map, { seq: 1 });
+    const lined = span(container, map, { seq: 2, underline: true });
+    expect(plain.style.textDecoration).toBe('');
+    expect(lined.style.textDecoration).toBe('underline');
+  });
+
+  it('adds and removes incrementally, keyed by seq', () => {
+    const map = new Map<number, HTMLSpanElement>();
+    const container = makeContainer();
+    span(container, map, { seq: 1 });
+    span(container, map, { seq: 2, col: 6 });
+    span(container, map, { seq: 3, col: 7 });
+    expect(container.children).toHaveLength(3);
+
+    removePredictionSpan(map, 2);
+    expect(container.children).toHaveLength(2);
+    expect(map.has(2)).toBe(false);
+    expect(map.has(1)).toBe(true);
+    expect(map.has(3)).toBe(true);
+
+    removePredictionSpan(map, 999); // unknown seq: no-op
+    expect(container.children).toHaveLength(2);
+  });
+
+  it('clearAllSpans empties both the DOM and the map', () => {
+    const map = new Map<number, HTMLSpanElement>();
+    const container = makeContainer();
+    span(container, map, { seq: 1 });
+    span(container, map, { seq: 2, col: 6 });
+    clearAllSpans(map);
+    expect(container.children).toHaveLength(0);
+    expect(map.size).toBe(0);
+  });
+
+  it('geometry is stable under devicePixelRatio 2 (dims are CSS px)', () => {
+    vi.stubGlobal('devicePixelRatio', 2);
+    const map = new Map<number, HTMLSpanElement>();
+    const s = span(makeContainer(), map);
+    expect(s.style.left).toBe(`${5 * 9}px`);
+    expect(s.style.top).toBe(`${3 * 18}px`);
+    expect(s.style.width).toBe('9px');
+  });
+});

packages/xterm-zerolag-input/test/predictive-echo-addon.test.ts

@@ -0,0 +1,538 @@
+/**
+ * @vitest-environment jsdom
+ *
+ * PredictiveEchoAddon unit tests: the algorithm laws (anchoring, prefix-only
+ * confirmation with cursor advance, two-pass mismatch cascade with neutral
+ * blanks, TTL, off-row grace, gates) and lifecycle safety.
+ *
+ * Timer-based cases fake `performance` explicitly: the addon clocks
+ * sentAt/TTL/grace with performance.now(), which vitest does NOT fake by
+ * default.
+ */
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
+import { PredictiveEchoAddon } from '../src/predictive-echo-addon.js';
+import { createMockTerminal } from './helpers.js';
+
+const TIMER_CONFIG = {
+  toFake: ['setTimeout', 'clearTimeout', 'setInterval', 'clearInterval', 'Date', 'performance'] as const,
+};
+
+/** Composer-like buffer: `› ` marker + placeholder, cursor at col 2 row 0. */
+function composerMock(opts: Parameters<typeof createMockTerminal>[0] = {}) {
+  return createMockTerminal({
+    buffer: { lines: ['› Use /skills to list', '', ''], cursorX: 2, cursorY: 0 },
+    ...opts,
+  });
+}
+
+function spansOf(mock: ReturnType<typeof createMockTerminal>): HTMLSpanElement[] {
+  const screen = mock.terminal.element.querySelector('.xterm-screen')!;
+  return Array.from(screen.querySelectorAll('[data-predictive-echo] span')) as HTMLSpanElement[];
+}
+
+async function flushMicrotasks() {
+  await Promise.resolve();
+  await Promise.resolve();
+}
+
+describe('PredictiveEchoAddon', () => {
+  let mock: ReturnType<typeof createMockTerminal>;
+  let addon: PredictiveEchoAddon;
+
+  beforeEach(() => {
+    vi.useFakeTimers(TIMER_CONFIG);
+    mock = composerMock();
+    addon = new PredictiveEchoAddon();
+    addon.activate(mock.terminal as never);
+  });
+
+  afterEach(() => {
+    addon.dispose();
+    mock.cleanup();
+    vi.useRealTimers();
+  });
+
+  it('paints a span at the cursor cell and returns true', () => {
+    expect(addon.predictChar('h')).toBe(true);
+    const spans = spansOf(mock);
+    expect(spans).toHaveLength(1);
+    expect(spans[0].textContent).toBe('h');
+    expect(spans[0].style.left).toBe(`${2 * 8.4}px`);
+    expect(spans[0].style.top).toBe('0px');
+    expect(addon.state.outstanding).toBe(1);
+  });
+
+  it('stacks predictions at anchor+cumulative width while the cursor is unmoved', () => {
+    addon.predictChar('h');
+    addon.predictChar('e');
+    addon.predictChar('y');
+    const spans = spansOf(mock);
+    expect(spans.map((s) => s.style.left)).toEqual([`${2 * 8.4}px`, `${3 * 8.4}px`, `${4 * 8.4}px`]);
+    expect(addon.state.anchor).toEqual({ row: 0, col: 2 });
+  });
+
+  it('re-anchors at the new cursor once outstanding drains to zero', async () => {
+    addon.predictChar('h');
+    mock.setLine(0, '› h');
+    mock.setCursor(3, 0);
+    mock.fireWriteParsed();
+    await flushMicrotasks();
+    expect(addon.state.outstanding).toBe(0);
+    expect(addon.state.anchor).toBeNull();
+
+    addon.predictChar('i');
+    expect(addon.state.anchor).toEqual({ row: 0, col: 3 });
+    expect(spansOf(mock)[0].style.left).toBe(`${3 * 8.4}px`);
+  });
+
+  it('inline reconcile inside predictChar absorbs an echo that landed between keystrokes', () => {
+    addon.predictChar('h');
+    // Echo lands but no onWriteParsed fires before the next keystroke
+    mock.setLine(0, '› h');
+    mock.setCursor(3, 0);
+    expect(addon.predictChar('i')).toBe(true);
+    // 'h' confirmed inline; 'i' anchored at the advanced cursor, not stacked
+    expect(addon.state.outstanding).toBe(1);
+    expect(addon.state.confirmedTotal).toBe(1);
+    expect(addon.state.anchor).toEqual({ row: 0, col: 3 });
+  });
+
+  it('confirms and removes exactly the echoed prefix (cell match + cursor advance)', async () => {
+    addon.predictChar('a');
+    addon.predictChar('b');
+    addon.predictChar('c');
+    mock.setLine(0, '› ab');
+    mock.setCursor(4, 0); // advanced past 'a' and 'b' only
+    mock.fireWriteParsed();
+    await flushMicrotasks();
+    expect(addon.state.confirmedTotal).toBe(2);
+    expect(addon.state.outstanding).toBe(1);
+    expect(spansOf(mock).map((s) => s.textContent)).toEqual(['c']);
+  });
+
+  it('partial confirmation never moves remaining spans (no jitter)', async () => {
+    addon.predictChar('a');
+    addon.predictChar('b');
+    const bLeft = spansOf(mock)[1].style.left;
+    mock.setLine(0, '› a');
+    mock.setCursor(3, 0);
+    mock.fireWriteParsed();
+    await flushMicrotasks();
+    expect(spansOf(mock)).toHaveLength(1);
+    expect(spansOf(mock)[0].style.left).toBe(bLeft);
+  });
+
+  it('does NOT confirm when the cell matches but the cursor has not advanced (in-place repaint)', async () => {
+    // Predict 'U' over the placeholder whose cell already shows 'U'
+    addon.predictChar('U');
+    expect(addon.state.outstanding).toBe(1);
+    // tmux repaints the identical row; cursor stays at the anchor
+    mock.fireWriteParsed();
+    await flushMicrotasks();
+    expect(addon.state.outstanding).toBe(1);
+    expect(addon.state.confirmedTotal).toBe(0);
+  });
+
+  it('does NOT confirm or drop when the predicted char equals the pre-existing snapshot', async () => {
+    addon.predictChar('U');
+    // Several passes over the unchanged placeholder: no confirm, no cascade
+    for (let i = 0; i < 4; i++) {
+      mock.fireWriteParsed();
+      await flushMicrotasks();
+    }
+    expect(addon.state.outstanding).toBe(1);
+    expect(addon.state.droppedTotal).toBe(0);
+  });
+
+  it('one transient mismatch survives; a persistent foreign cell cascades (two-pass rule)', async () => {
+    addon.predictChar('a');
+    mock.setLine(0, '› Z'); // foreign non-blank at the predicted cell
+    mock.fireWriteParsed();
+    await flushMicrotasks();
+    expect(addon.state.outstanding).toBe(1); // pass 1: survives
+
+    // Transient recovery resets the counter
+    mock.setLine(0, '› Use /skills to list');
+    mock.fireWriteParsed();
+    await flushMicrotasks();
+    mock.setLine(0, '› Z');
+    mock.fireWriteParsed();
+    await flushMicrotasks();
+    expect(addon.state.outstanding).toBe(1); // count restarted, pass 1 again
+
+    mock.fireWriteParsed();
+    await flushMicrotasks();
+    expect(addon.state.outstanding).toBe(0); // pass 2: cascaded
+    expect(addon.state.droppedTotal).toBe(1);
+    expect(spansOf(mock)).toHaveLength(0);
+  });
+
+  it('blank cells are neutral: placeholder cleared under predictions does not cascade', async () => {
+    // Predict over placeholder text, then codex clears the placeholder on
+    // first echo: later cells become blank, which must NOT count as
+    // foreign (measured behavior; without this, fast typing over the
+    // placeholder drops exactly when RTT is high).
+    addon.predictChar('h');
+    addon.predictChar('i');
+    mock.setLine(0, '› h'); // 'h' echoed; placeholder gone; 'i' cell now blank
+    mock.setCursor(3, 0);
+    for (let i = 0; i < 4; i++) {
+      mock.fireWriteParsed();
+      await flushMicrotasks();
+    }
+    expect(addon.state.confirmedTotal).toBe(1);
+    expect(addon.state.outstanding).toBe(1); // 'i' still pending, TTL-bounded
+    expect(addon.state.droppedTotal).toBe(0);
+  });
+
+  it('mismatch cascade drops the record and all later ones, earlier confirmed stay gone', async () => {
+    addon.predictChar('a');
+    addon.predictChar('b');
+    addon.predictChar('c');
+    mock.setLine(0, '› aXX'); // 'a' echoed; foreign 'X' under 'b' and 'c'
+    mock.setCursor(3, 0);
+    mock.fireWriteParsed();
+    await flushMicrotasks();
+    mock.fireWriteParsed();
+    await flushMicrotasks();
+    expect(addon.state.confirmedTotal).toBe(1);
+    expect(addon.state.droppedTotal).toBe(2);
+    expect(addon.state.outstanding).toBe(0);
+    expect(spansOf(mock)).toHaveLength(0);
+  });
+
+  it('TTL expiry drops predictions and leaves no timers armed (fake timers)', () => {
+    addon.predictChar('a');
+    addon.predictChar('b');
+    expect(vi.getTimerCount()).toBe(1);
+    vi.advanceTimersByTime(1100);
+    expect(addon.state.outstanding).toBe(0);
+    expect(addon.state.droppedTotal).toBe(2);
+    expect(spansOf(mock)).toHaveLength(0);
+    expect(vi.getTimerCount()).toBe(0);
+  });
+
+  it('TTL timer re-arms for remaining records after a partial confirm', async () => {
+    addon.predictChar('a'); // t=0, deadline ~1001
+    vi.advanceTimersByTime(600);
+    addon.predictChar('b'); // t=600, deadline ~1601
+    // Echo confirms 'a' before its TTL; 'b' remains
+    mock.setLine(0, '› a');
+    mock.setCursor(3, 0);
+    mock.fireWriteParsed();
+    await flushMicrotasks();
+    expect(addon.state.outstanding).toBe(1);
+    vi.advanceTimersByTime(450); // t=1050: a's timer fired, b (age 450) survives
+    expect(addon.state.outstanding).toBe(1);
+    expect(vi.getTimerCount()).toBe(1); // re-armed for b
+    vi.advanceTimersByTime(600); // t=1650: b expired
+    expect(addon.state.outstanding).toBe(0);
+    expect(vi.getTimerCount()).toBe(0);
+  });
+
+  it('cursor off anchor row within grace keeps predictions; sustained off-row drops all', async () => {
+    addon.predictChar('a');
+    mock.setCursor(0, 5);
+    mock.fireWriteParsed();
+    await flushMicrotasks();
+    expect(addon.state.outstanding).toBe(1); // transient excursion tolerated
+
+    vi.advanceTimersByTime(200); // > cursorGraceMs (150)
+    mock.fireWriteParsed();
+    await flushMicrotasks();
+    expect(addon.state.outstanding).toBe(0);
+    expect(spansOf(mock)).toHaveLength(0);
+  });
+
+  it('viewportY !== baseY clears predictions (scrolled up)', async () => {
+    addon.predictChar('a');
+    mock.setScroll(0, 5); // user scrolled: viewport pinned above baseY
+    mock.fireWriteParsed();
+    await flushMicrotasks();
+    expect(addon.state.outstanding).toBe(0);
+    // And no new predictions while scrolled
+    expect(addon.predictChar('b')).toBe(false);
+  });
+
+  it('maxPending: the 33rd predictChar returns false', () => {
+    for (let i = 0; i < 32; i++) {
+      expect(addon.predictChar('x')).toBe(true);
+    }
+    expect(addon.predictChar('y')).toBe(false);
+    expect(addon.state.outstanding).toBe(32);
+  });
+
+  it('edge margin: a prediction landing within edgeMarginCells of cols returns false', () => {
+    mock.setCursor(75, 0); // cols 80, margin 4: col 75 + 1 <= 76 allowed
+    expect(addon.predictChar('a')).toBe(true);
+    // Next lands at col 76: 77 > 76 suppressed
+    expect(addon.predictChar('b')).toBe(false);
+  });
+
+  it('predictWhen gate false suppresses painting, predictChar just returns false', () => {
+    addon.setPredictWhen(() => false);
+    expect(addon.predictChar('a')).toBe(false);
+    expect(spansOf(mock)).toHaveLength(0);
+  });
+
+  it('setPredictWhen(null) removes the gate at runtime', () => {
+    addon.setPredictWhen(() => false);
+    expect(addon.predictChar('a')).toBe(false);
+    addon.setPredictWhen(null);
+    expect(addon.predictChar('a')).toBe(true);
+  });
+
+  it('multi-codepoint graphemes and control chars return false', () => {
+    for (const bad of ['ab', '\x1b', '\x03', '\r', '\n', '\t', '\x7f', '👨‍👩‍👧', '']) {
+      expect(addon.predictChar(bad)).toBe(false);
+    }
+    expect(spansOf(mock)).toHaveLength(0);
+    // Single astral emoji IS a single codepoint: predicted (width 2)
+    expect(addon.predictChar('😀')).toBe(true);
+  });
+
+  it('CJK: 2-cell span, next prediction offsets by 2, confirm reads the leading cell', async () => {
+    expect(addon.predictChar('你')).toBe(true);
+    const first = spansOf(mock)[0];
+    expect(first.style.width).toBe(`${2 * 8.4}px`);
+    addon.predictChar('a');
+    expect(spansOf(mock)[1].style.left).toBe(`${4 * 8.4}px`); // 2 + width 2
+
+    mock.setLine(0, '› 你');
+    mock.setCursor(4, 0); // advanced past the wide char
+    mock.fireWriteParsed();
+    await flushMicrotasks();
+    expect(addon.state.confirmedTotal).toBe(1);
+    expect(addon.state.outstanding).toBe(1);
+  });
+
+  it('getCell-less terminal: ASCII fallback works, wide chars suppressed', () => {
+    const bare = createMockTerminal({
+      buffer: { lines: ['› ', ''], cursorX: 2, cursorY: 0 },
+      getCellSupport: false,
+    });
+    const a = new PredictiveEchoAddon();
+    a.activate(bare.terminal as never);
+    expect(a.predictChar('x')).toBe(true);
+    expect(a.predictChar('你')).toBe(false);
+    a.dispose();
+    bare.cleanup();
+  });
+
+  it("'' and ' ' cell reads are equivalent for snapshot and confirm", async () => {
+    // Snapshot beyond the line text reads '' -> normalized ' '
+    mock.setLine(0, '› ');
+    addon.predictChar('a'); // snapshot at col 2 is '' -> ' '
+    // A repaint that writes explicit spaces must not count as foreign
+    mock.setLine(0, '›   ');
+    mock.fireWriteParsed();
+    await flushMicrotasks();
+    mock.fireWriteParsed();
+    await flushMicrotasks();
+    expect(addon.state.outstanding).toBe(1);
+    expect(addon.state.droppedTotal).toBe(0);
+  });
+
+  it('predictBackspace pops newest, returns false when empty, never touches confirmed', async () => {
+    expect(addon.predictBackspace()).toBe(false);
+    addon.reconcile(); // the empty pop armed the anchor hold; release it
+    addon.predictChar('a');
+    addon.predictChar('b');
+    expect(addon.predictBackspace()).toBe(true);
+    expect(addon.state.outstanding).toBe(1);
+    expect(spansOf(mock).map((s) => s.textContent)).toEqual(['a']);
+
+    mock.setLine(0, '› a');
+    mock.setCursor(3, 0);
+    mock.fireWriteParsed();
+    await flushMicrotasks();
+    expect(addon.state.confirmedTotal).toBe(1);
+    expect(addon.predictBackspace()).toBe(false); // confirmed text is not popped
+  });
+
+  it('clearPredictions empties the container, resets anchor, cancels the timer', () => {
+    addon.predictChar('a');
+    addon.predictChar('b');
+    expect(vi.getTimerCount()).toBe(1);
+    addon.clearPredictions();
+    expect(spansOf(mock)).toHaveLength(0);
+    expect(addon.state.outstanding).toBe(0);
+    expect(addon.state.anchor).toBeNull();
+    expect(vi.getTimerCount()).toBe(0);
+  });
+
+  it('onWriteParsed reconcile is debounced to one pass per burst', async () => {
+    addon.predictChar('a');
+    mock.setLine(0, '› Z'); // foreign cell: each PASS increments mismatches
+    mock.fireWriteParsed();
+    mock.fireWriteParsed();
+    mock.fireWriteParsed();
+    await flushMicrotasks();
+    // Three synchronous fires coalesced into ONE pass: not dropped yet
+    expect(addon.state.outstanding).toBe(1);
+    mock.fireWriteParsed();
+    await flushMicrotasks();
+    expect(addon.state.outstanding).toBe(0); // second pass cascades
+  });
+
+  it('onResize clears predictions (cell geometry changed)', () => {
+    addon.predictChar('a');
+    mock.fireResize(120, 40);
+    expect(addon.state.outstanding).toBe(0);
+    expect(spansOf(mock)).toHaveLength(0);
+  });
+
+  it('works without onWriteParsed via manual reconcile()', () => {
+    const bare = composerMock({ emitters: false });
+    const a = new PredictiveEchoAddon();
+    a.activate(bare.terminal as never);
+    a.predictChar('h');
+    bare.setLine(0, '› h');
+    bare.setCursor(3, 0);
+    a.reconcile();
+    expect(a.state.confirmedTotal).toBe(1);
+    expect(a.state.outstanding).toBe(0);
+    a.dispose();
+    bare.cleanup();
+  });
+
+  it('dispose unhooks listeners and removes the container', () => {
+    expect(mock.writeParsedListenerCount()).toBe(1);
+    expect(mock.resizeListenerCount()).toBe(1);
+    addon.predictChar('a');
+    addon.dispose();
+    expect(mock.writeParsedListenerCount()).toBe(0);
+    expect(mock.resizeListenerCount()).toBe(0);
+    const screen = mock.terminal.element.querySelector('.xterm-screen')!;
+    expect(screen.querySelector('[data-predictive-echo]')).toBeNull();
+    expect(vi.getTimerCount()).toBe(0);
+  });
+
+  it('every public method is safe before activate and after dispose', () => {
+    const fresh = new PredictiveEchoAddon();
+    expect(fresh.predictChar('a')).toBe(false);
+    expect(fresh.predictBackspace()).toBe(false);
+    fresh.clearPredictions();
+    fresh.reconcile();
+    fresh.refreshFont();
+    fresh.setPredictWhen(() => true);
+    expect(fresh.hasPredictions).toBe(false);
+    expect(fresh.state.outstanding).toBe(0);
+
+    addon.dispose();
+    expect(addon.predictChar('a')).toBe(false);
+    expect(addon.predictBackspace()).toBe(false);
+    addon.clearPredictions();
+    addon.reconcile();
+    addon.refreshFont();
+    expect(addon.hasPredictions).toBe(false);
+  });
+
+  it('hostile terminal stubs never propagate exceptions', () => {
+    const hostile = {
+      element: document.createElement('div'),
+      cols: 80,
+      rows: 24,
+      options: {},
+      buffer: {
+        active: {
+          viewportY: 0,
+          baseY: 0,
+          cursorX: 0,
+          cursorY: 0,
+          getLine: () => {
+            throw new Error('boom');
+          },
+        },
+      },
+    };
+    const a = new PredictiveEchoAddon();
+    expect(() => a.activate(hostile as never)).not.toThrow();
+    expect(a.predictChar('x')).toBe(false); // getLine throws inside -> caught
+    expect(() => a.reconcile()).not.toThrow();
+    a.dispose();
+
+    // Terminal with no render dimensions: addon inert, no throws
+    const dimless = composerMock();
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    delete (dimless.terminal as any)._core;
+    const b = new PredictiveEchoAddon();
+    b.activate(dimless.terminal as never);
+    expect(b.predictChar('x')).toBe(false);
+    b.dispose();
+    dimless.cleanup();
+  });
+
+  it('underlinePredictions styles spans; refreshFont re-reads the rendered color', () => {
+    const themed = composerMock({ theme: { foreground: '#aabbcc', background: '#112233' } });
+    // The recipe prefers the computed .xterm-rows color (what xterm really
+    // renders with); give the mock rows an explicit color like a real skin.
+    const rows = themed.terminal.element.querySelector('.xterm-rows') as HTMLElement;
+    rows.style.color = 'rgb(170, 187, 204)';
+    const a = new PredictiveEchoAddon({ underlinePredictions: true });
+    a.activate(themed.terminal as never);
+    a.predictChar('u');
+    const span = themed.terminal.element.querySelector('.xterm-screen span') as HTMLSpanElement;
+    expect(span.style.textDecoration).toBe('underline');
+    expect(span.style.color).toBe('rgb(170, 187, 204)');
+
+    rows.style.color = 'rgb(255, 0, 0)'; // skin change
+    a.refreshFont();
+    a.clearPredictions();
+    a.reconcile(); // release the anchor hold armed by the clear
+    a.predictChar('v');
+    const span2 = themed.terminal.element.querySelector('.xterm-screen span') as HTMLSpanElement;
+    expect(span2.style.color).toBe('rgb(255, 0, 0)');
+    a.dispose();
+    themed.cleanup();
+  });
+
+  it('anchor hold: backspace into echoed text suppresses prediction until a write parses', async () => {
+    // \x7f went to the wire with nothing outstanding: the cursor will move
+    // in a way the display has not shown, so anchoring now paints one cell
+    // off (review finding: "tehh" ghosts on backspace-then-retype at RTT)
+    expect(addon.predictBackspace()).toBe(false);
+    expect(addon.predictChar('x')).toBe(false);
+    expect(spansOf(mock)).toHaveLength(0);
+    mock.fireWriteParsed(); // the display caught up
+    await flushMicrotasks();
+    expect(addon.predictChar('x')).toBe(true);
+  });
+
+  it('anchor hold: clearPredictions suppresses until a write parses (or manual reconcile)', async () => {
+    addon.predictChar('a');
+    addon.clearPredictions(); // consumer saw Enter/Esc/arrow/paste
+    expect(addon.predictChar('b')).toBe(false);
+    mock.fireWriteParsed();
+    await flushMicrotasks();
+    expect(addon.predictChar('b')).toBe(true);
+  });
+
+  it('anchor hold: the inline predictChar reconcile does NOT release it', () => {
+    addon.clearPredictions();
+    // Several keystrokes in a row before any echo: all suppressed, because
+    // predictChar's inline pass must not count as the display catching up
+    expect(addon.predictChar('a')).toBe(false);
+    expect(addon.predictChar('b')).toBe(false);
+    addon.reconcile(); // public/manual pass IS the caught-up contract
+    expect(addon.predictChar('c')).toBe(true);
+  });
+
+  it('state getter reports outstanding/confirmedTotal/droppedTotal/anchor', async () => {
+    expect(addon.state).toEqual({ outstanding: 0, confirmedTotal: 0, droppedTotal: 0, anchor: null });
+    addon.predictChar('a');
+    addon.predictChar('b');
+    expect(addon.state.outstanding).toBe(2);
+    expect(addon.state.anchor).toEqual({ row: 0, col: 2 });
+    expect(addon.hasPredictions).toBe(true);
+
+    mock.setLine(0, '› a');
+    mock.setCursor(3, 0);
+    mock.fireWriteParsed();
+    await flushMicrotasks();
+    addon.clearPredictions();
+    expect(addon.state.confirmedTotal).toBe(1);
+    expect(addon.state.droppedTotal).toBe(1);
+    expect(addon.hasPredictions).toBe(false);
+  });
+});

packages/xterm-zerolag-input/test/predictive-echo-fuzz.test.ts

@@ -0,0 +1,125 @@
+/**
+ * @vitest-environment jsdom
+ *
+ * Layer 3: seeded property fuzz against the REAL xterm parser. Random
+ * interleavings of predictions, backspaces, clears, echo writes (correct,
+ * partial, foreign), screen clears, scrolls and cursor jumps; invariants
+ * checked after EVERY op:
+ *   1. span count === outstanding record count, every span inside the grid
+ *   2. no public method throws
+ *   3. eventual convergence: after the run settles (TTL elapse + reconcile),
+ *      outstanding === 0 and the span container is empty
+ *
+ * Reproduce a failure with FUZZ_SEED=<seed> FUZZ_ITERS=<n> npx vitest run
+ * test/predictive-echo-fuzz.test.ts (the failing seed+iter is in the
+ * assertion message).
+ */
+import { describe, expect, it } from 'vitest';
+import { PredictiveEchoAddon } from '../src/predictive-echo-addon.js';
+import { CELL_H, CELL_W, createReplayTerminal } from './replay-helpers.js';
+
+const SEED = Number(process.env.FUZZ_SEED ?? 1337);
+const TOTAL_ITERS = Number(process.env.FUZZ_ITERS ?? 500);
+const BATCHES = 4;
+const TTL_MS = 5;
+
+function mulberry32(seed: number) {
+  let a = seed >>> 0;
+  return () => {
+    a |= 0;
+    a = (a + 0x6d2b79f5) | 0;
+    let t = Math.imul(a ^ (a >>> 15), 1 | a);
+    t = (t + Math.imul(t ^ (t >>> 7), 61 | t)) ^ t;
+    return ((t ^ (t >>> 14)) >>> 0) / 4294967296;
+  };
+}
+
+const ALPHABET = [...'abcdefghij XZ!?', '你', '好', '😀'];
+
+function sleep(ms: number) {
+  return new Promise((r) => setTimeout(r, ms));
+}
+
+async function fuzzIteration(iter: number, label: string) {
+  const rand = mulberry32(SEED + iter);
+  const rt = createReplayTerminal(60, 12);
+  const addon = new PredictiveEchoAddon({ ttlMs: TTL_MS });
+  addon.activate(rt.hybrid);
+  const ctx = `${label} seed=${SEED} iter=${iter}`;
+
+  // Park the cursor mid-screen like a composer would
+  await rt.write('\x1b[6;3H');
+
+  const ops = 4 + Math.floor(rand() * 12);
+  for (let i = 0; i < ops; i++) {
+    const r = rand();
+    if (r < 0.35) {
+      addon.predictChar(ALPHABET[Math.floor(rand() * ALPHABET.length)]);
+    } else if (r < 0.43) {
+      addon.predictBackspace();
+    } else if (r < 0.48) {
+      addon.clearPredictions();
+    } else if (r < 0.62) {
+      // Correct-ish echo: write a run of random chars at the anchor and
+      // leave the cursor advanced (confirms whatever happens to match)
+      const a = addon.state.anchor;
+      if (a) {
+        const n = 1 + Math.floor(rand() * 3);
+        let text = '';
+        for (let k = 0; k < n; k++) text += ALPHABET[Math.floor(rand() * ALPHABET.length)];
+        await rt.write(`\x1b[${a.row + 1};${a.col + 1}H${text}`);
+      }
+    } else if (r < 0.72) {
+      // Foreign rewrite across the anchor row
+      await rt.write(`\x1b[6;1H${'Q'.repeat(1 + Math.floor(rand() * 20))}`);
+    } else if (r < 0.8) {
+      // Scroll: newlines at the bottom push history
+      await rt.write(`\x1b[12;1H${'\r\n'.repeat(1 + Math.floor(rand() * 3))}`);
+    } else if (r < 0.85) {
+      await rt.write('\x1b[2J\x1b[H'); // clear screen + home
+    } else if (r < 0.95) {
+      addon.reconcile();
+    } else {
+      // Cursor jump
+      const row = 1 + Math.floor(rand() * 12);
+      const col = 1 + Math.floor(rand() * 60);
+      await rt.write(`\x1b[${row};${col}H`);
+    }
+    await Promise.resolve(); // flush the debounced reconcile microtask
+
+    // Invariant 1: span/record parity + grid bounds, after every op
+    expect(rt.spanCount(), ctx).toBe(addon.state.outstanding);
+    for (const s of rt.spans()) {
+      const left = parseFloat(s.style.left);
+      const width = parseFloat(s.style.width);
+      const top = parseFloat(s.style.top);
+      expect(left + width, ctx).toBeLessThanOrEqual(60 * CELL_W);
+      expect(top, ctx).toBeLessThanOrEqual(11 * CELL_H);
+      expect(left, ctx).toBeGreaterThanOrEqual(0);
+    }
+  }
+
+  // Invariant 3: eventual convergence via echo/TTL, never via dispose
+  if (addon.state.outstanding > 0) {
+    await sleep(TTL_MS + 15);
+    addon.reconcile();
+  }
+  expect(addon.state.outstanding, ctx).toBe(0);
+  expect(rt.spanCount(), ctx).toBe(0);
+
+  addon.dispose();
+  rt.cleanup();
+}
+
+describe(`predictive echo fuzz (${TOTAL_ITERS} iterations, seed ${SEED})`, () => {
+  const perBatch = Math.ceil(TOTAL_ITERS / BATCHES);
+  for (let b = 0; b < BATCHES; b++) {
+    it(`batch ${b + 1}/${BATCHES}`, async () => {
+      const start = b * perBatch;
+      const end = Math.min(start + perBatch, TOTAL_ITERS);
+      for (let iter = start; iter < end; iter++) {
+        await fuzzIteration(iter, `batch${b + 1}`);
+      }
+    }, 60000);
+  }
+});

packages/xterm-zerolag-input/test/prompt-finder.test.ts

@@ -4,159 +4,155 @@ import { findPrompt, readTextAfterPrompt } from '../src/prompt-finder.js';
 import type { XtermTerminal, PromptFinder } from '../src/types.js';
 
 function term(lines: string[]) {
-    return createMockTerminal({ buffer: { lines } });
+  return createMockTerminal({ buffer: { lines } });
 }
 
 describe('findPrompt', () => {
-    describe('character strategy', () => {
-        it('finds $ prompt at column 0', () => {
-            const { terminal, cleanup } = term(['output line', '$ ls -la']);
-            const finder: PromptFinder = { type: 'character', char: '$' };
-            const pos = findPrompt(terminal as unknown as XtermTerminal, finder);
-            expect(pos).toEqual({ row: 1, col: 0 });
-            cleanup();
-        });
-
-        it('finds > prompt', () => {
-            const { terminal, cleanup } = term(['> hello']);
-            const finder: PromptFinder = { type: 'character', char: '>' };
-            const pos = findPrompt(terminal as unknown as XtermTerminal, finder);
-            expect(pos).toEqual({ row: 0, col: 0 });
-            cleanup();
-        });
-
-        it('finds prompt with prefix (user@host)', () => {
-            const { terminal, cleanup } = term(['user@host:~$ command']);
-            const finder: PromptFinder = { type: 'character', char: '$' };
-            const pos = findPrompt(terminal as unknown as XtermTerminal, finder);
-            expect(pos).toEqual({ row: 0, col: 11 });
-            cleanup();
-        });
-
-        it('scans bottom-up and returns lowest match', () => {
-            const { terminal, cleanup } = term([
-                '$ old prompt',
-                'output',
-                '$ current prompt',
-            ]);
-            const finder: PromptFinder = { type: 'character', char: '$' };
-            const pos = findPrompt(terminal as unknown as XtermTerminal, finder);
-            expect(pos).toEqual({ row: 2, col: 0 });
-            cleanup();
-        });
-
-        it('returns null when no prompt found', () => {
-            const { terminal, cleanup } = term(['no prompt here', 'or here']);
-            const finder: PromptFinder = { type: 'character', char: '$' };
-            const pos = findPrompt(terminal as unknown as XtermTerminal, finder);
-            expect(pos).toBeNull();
-            cleanup();
-        });
-
-        it('finds Unicode prompt character', () => {
-            const { terminal, cleanup } = term(['\u276f hello']);
-            const finder: PromptFinder = { type: 'character', char: '\u276f' };
-            const pos = findPrompt(terminal as unknown as XtermTerminal, finder);
-            expect(pos).toEqual({ row: 0, col: 0 });
-            cleanup();
-        });
+  describe('character strategy', () => {
+    it('finds $ prompt at column 0', () => {
+      const { terminal, cleanup } = term(['output line', '$ ls -la']);
+      const finder: PromptFinder = { type: 'character', char: '$' };
+      const pos = findPrompt(terminal as unknown as XtermTerminal, finder);
+      expect(pos).toEqual({ row: 1, col: 0 });
+      cleanup();
     });
 
-    describe('regex strategy', () => {
-        it('finds regex prompt', () => {
-            const { terminal, cleanup } = term(['user@host:~/dir$ ls']);
-            const finder: PromptFinder = { type: 'regex', pattern: /\$/ };
-            const pos = findPrompt(terminal as unknown as XtermTerminal, finder);
-            expect(pos).not.toBeNull();
-            expect(pos!.col).toBe(15);
-            cleanup();
-        });
-
-        it('matches complex PS1 patterns', () => {
-            const { terminal, cleanup } = term(['(venv) user % cmd']);
-            const finder: PromptFinder = { type: 'regex', pattern: /%/ };
-            const pos = findPrompt(terminal as unknown as XtermTerminal, finder);
-            expect(pos).not.toBeNull();
-            expect(pos!.col).toBe(12);
-            cleanup();
-        });
-
-        it('returns null on no match', () => {
-            const { terminal, cleanup } = term(['just output']);
-            const finder: PromptFinder = { type: 'regex', pattern: /\$\s*$/ };
-            const pos = findPrompt(terminal as unknown as XtermTerminal, finder);
-            expect(pos).toBeNull();
-            cleanup();
-        });
-
-        it('handles global flag safely (strips g to avoid lastIndex)', () => {
-            const { terminal, cleanup } = term(['user@host:~$ cmd']);
-            const finder: PromptFinder = { type: 'regex', pattern: /\$/g };
-            const pos = findPrompt(terminal as unknown as XtermTerminal, finder);
-            expect(pos).not.toBeNull();
-            expect(pos!.col).toBe(11);
-            // Call again — should return same result (no lastIndex drift)
-            const pos2 = findPrompt(terminal as unknown as XtermTerminal, finder);
-            expect(pos2).toEqual(pos);
-            cleanup();
-        });
+    it('finds > prompt', () => {
+      const { terminal, cleanup } = term(['> hello']);
+      const finder: PromptFinder = { type: 'character', char: '>' };
+      const pos = findPrompt(terminal as unknown as XtermTerminal, finder);
+      expect(pos).toEqual({ row: 0, col: 0 });
+      cleanup();
     });
 
-    describe('custom strategy', () => {
-        it('uses custom finder function', () => {
-            const { terminal, cleanup } = term(['anything']);
-            const finder: PromptFinder = {
-                type: 'custom',
-                find: () => ({ row: 5, col: 10 }),
-            };
-            const pos = findPrompt(terminal as unknown as XtermTerminal, finder);
-            expect(pos).toEqual({ row: 5, col: 10 });
-            cleanup();
-        });
-
-        it('handles null from custom finder', () => {
-            const { terminal, cleanup } = term(['anything']);
-            const finder: PromptFinder = {
-                type: 'custom',
-                find: () => null,
-            };
-            const pos = findPrompt(terminal as unknown as XtermTerminal, finder);
-            expect(pos).toBeNull();
-            cleanup();
-        });
+    it('finds prompt with prefix (user@host)', () => {
+      const { terminal, cleanup } = term(['user@host:~$ command']);
+      const finder: PromptFinder = { type: 'character', char: '$' };
+      const pos = findPrompt(terminal as unknown as XtermTerminal, finder);
+      expect(pos).toEqual({ row: 0, col: 11 });
+      cleanup();
     });
+
+    it('scans bottom-up and returns lowest match', () => {
+      const { terminal, cleanup } = term(['$ old prompt', 'output', '$ current prompt']);
+      const finder: PromptFinder = { type: 'character', char: '$' };
+      const pos = findPrompt(terminal as unknown as XtermTerminal, finder);
+      expect(pos).toEqual({ row: 2, col: 0 });
+      cleanup();
+    });
+
+    it('returns null when no prompt found', () => {
+      const { terminal, cleanup } = term(['no prompt here', 'or here']);
+      const finder: PromptFinder = { type: 'character', char: '$' };
+      const pos = findPrompt(terminal as unknown as XtermTerminal, finder);
+      expect(pos).toBeNull();
+      cleanup();
+    });
+
+    it('finds Unicode prompt character', () => {
+      const { terminal, cleanup } = term(['\u276f hello']);
+      const finder: PromptFinder = { type: 'character', char: '\u276f' };
+      const pos = findPrompt(terminal as unknown as XtermTerminal, finder);
+      expect(pos).toEqual({ row: 0, col: 0 });
+      cleanup();
+    });
+  });
+
+  describe('regex strategy', () => {
+    it('finds regex prompt', () => {
+      const { terminal, cleanup } = term(['user@host:~/dir$ ls']);
+      const finder: PromptFinder = { type: 'regex', pattern: /\$/ };
+      const pos = findPrompt(terminal as unknown as XtermTerminal, finder);
+      expect(pos).not.toBeNull();
+      expect(pos!.col).toBe(15);
+      cleanup();
+    });
+
+    it('matches complex PS1 patterns', () => {
+      const { terminal, cleanup } = term(['(venv) user % cmd']);
+      const finder: PromptFinder = { type: 'regex', pattern: /%/ };
+      const pos = findPrompt(terminal as unknown as XtermTerminal, finder);
+      expect(pos).not.toBeNull();
+      expect(pos!.col).toBe(12);
+      cleanup();
+    });
+
+    it('returns null on no match', () => {
+      const { terminal, cleanup } = term(['just output']);
+      const finder: PromptFinder = { type: 'regex', pattern: /\$\s*$/ };
+      const pos = findPrompt(terminal as unknown as XtermTerminal, finder);
+      expect(pos).toBeNull();
+      cleanup();
+    });
+
+    it('handles global flag safely (strips g to avoid lastIndex)', () => {
+      const { terminal, cleanup } = term(['user@host:~$ cmd']);
+      const finder: PromptFinder = { type: 'regex', pattern: /\$/g };
+      const pos = findPrompt(terminal as unknown as XtermTerminal, finder);
+      expect(pos).not.toBeNull();
+      expect(pos!.col).toBe(11);
+      // Call again — should return same result (no lastIndex drift)
+      const pos2 = findPrompt(terminal as unknown as XtermTerminal, finder);
+      expect(pos2).toEqual(pos);
+      cleanup();
+    });
+  });
+
+  describe('custom strategy', () => {
+    it('uses custom finder function', () => {
+      const { terminal, cleanup } = term(['anything']);
+      const finder: PromptFinder = {
+        type: 'custom',
+        find: () => ({ row: 5, col: 10 }),
+      };
+      const pos = findPrompt(terminal as unknown as XtermTerminal, finder);
+      expect(pos).toEqual({ row: 5, col: 10 });
+      cleanup();
+    });
+
+    it('handles null from custom finder', () => {
+      const { terminal, cleanup } = term(['anything']);
+      const finder: PromptFinder = {
+        type: 'custom',
+        find: () => null,
+      };
+      const pos = findPrompt(terminal as unknown as XtermTerminal, finder);
+      expect(pos).toBeNull();
+      cleanup();
+    });
+  });
 });
 
 describe('readTextAfterPrompt', () => {
-    it('reads text after prompt with offset', () => {
-        const { terminal, cleanup } = term(['$ hello world']);
-        const prompt = { row: 0, col: 0 };
-        const text = readTextAfterPrompt(terminal as unknown as XtermTerminal, prompt, 2);
-        expect(text).toBe('hello world');
-        cleanup();
-    });
+  it('reads text after prompt with offset', () => {
+    const { terminal, cleanup } = term(['$ hello world']);
+    const prompt = { row: 0, col: 0 };
+    const text = readTextAfterPrompt(terminal as unknown as XtermTerminal, prompt, 2);
+    expect(text).toBe('hello world');
+    cleanup();
+  });
 
-    it('returns empty string for empty prompt line', () => {
-        const { terminal, cleanup } = term(['$ ']);
-        const prompt = { row: 0, col: 0 };
-        const text = readTextAfterPrompt(terminal as unknown as XtermTerminal, prompt, 2);
-        expect(text).toBe('');
-        cleanup();
-    });
+  it('returns empty string for empty prompt line', () => {
+    const { terminal, cleanup } = term(['$ ']);
+    const prompt = { row: 0, col: 0 };
+    const text = readTextAfterPrompt(terminal as unknown as XtermTerminal, prompt, 2);
+    expect(text).toBe('');
+    cleanup();
+  });
 
-    it('trims trailing whitespace', () => {
-        const { terminal, cleanup } = term(['$ hello   ']);
-        const prompt = { row: 0, col: 0 };
-        const text = readTextAfterPrompt(terminal as unknown as XtermTerminal, prompt, 2);
-        expect(text).toBe('hello');
-        cleanup();
-    });
+  it('trims trailing whitespace', () => {
+    const { terminal, cleanup } = term(['$ hello   ']);
+    const prompt = { row: 0, col: 0 };
+    const text = readTextAfterPrompt(terminal as unknown as XtermTerminal, prompt, 2);
+    expect(text).toBe('hello');
+    cleanup();
+  });
 
-    it('handles offset for complex prompts', () => {
-        const { terminal, cleanup } = term(['user@host:~$ ls -la']);
-        const prompt = { row: 0, col: 11 };
-        const text = readTextAfterPrompt(terminal as unknown as XtermTerminal, prompt, 2);
-        expect(text).toBe('ls -la');
-        cleanup();
-    });
+  it('handles offset for complex prompts', () => {
+    const { terminal, cleanup } = term(['user@host:~$ ls -la']);
+    const prompt = { row: 0, col: 11 };
+    const text = readTextAfterPrompt(terminal as unknown as XtermTerminal, prompt, 2);
+    expect(text).toBe('ls -la');
+    cleanup();
+  });
 });

packages/xterm-zerolag-input/test/raw-imports.d.ts

@@ -0,0 +1,5 @@
+/** Vite `?raw` imports used by replay-helpers.ts (fixture JSONL as strings). */
+declare module '*.jsonl?raw' {
+  const content: string;
+  export default content;
+}

packages/xterm-zerolag-input/test/replay-helpers.ts

@@ -0,0 +1,173 @@
+/**
+ * Replay-test helpers: a structural hybrid terminal whose buffer, cursor and
+ * onWriteParsed delegate to a REAL @xterm/headless Terminal (so fixtures run
+ * through the real parser), while `element` is a jsdom div the addon can
+ * paint spans into. Works because XtermTerminal is structurally typed.
+ *
+ * Also carries the test-side mirror of Codeman's classifyPredictInput() and
+ * codex composer gate (the real ones live in terminal-ui.js and are pinned by
+ * the repo's Layer 4 vm tests; keep the two in sync).
+ */
+import { Terminal } from '@xterm/headless';
+import type { XtermTerminal } from '../src/types.js';
+// ?raw imports keep the jsdom environment free of node: builtins
+import pasteBracketed from './fixtures/codex/paste-bracketed.jsonl?raw';
+import slashPicker from './fixtures/codex/slash-picker.jsonl?raw';
+import streamingBurst from './fixtures/codex/streaming-burst.jsonl?raw';
+import streamingReal from './fixtures/codex/streaming-real.jsonl?raw';
+import trustModal from './fixtures/codex/trust-modal.jsonl?raw';
+import typeHello from './fixtures/codex/type-hello.jsonl?raw';
+import wrap from './fixtures/codex/wrap.jsonl?raw';
+
+const FIXTURES: Record<string, string> = {
+  'paste-bracketed': pasteBracketed,
+  'slash-picker': slashPicker,
+  'streaming-burst': streamingBurst,
+  'streaming-real': streamingReal,
+  'trust-modal': trustModal,
+  'type-hello': typeHello,
+  wrap,
+};
+
+export const CELL_W = 9;
+export const CELL_H = 18;
+
+export interface FixtureLine {
+  delayMs?: number;
+  keyAt?: boolean;
+  data: string;
+}
+
+export interface FixtureMeta {
+  scenario: string;
+  cols: number;
+  rows: number;
+  codexVersion: string;
+  recordedAt: string;
+}
+
+export function loadFixture(name: string): { meta: FixtureMeta; lines: FixtureLine[] } {
+  const content = FIXTURES[name];
+  if (!content) throw new Error(`unknown fixture ${name}`);
+  const raw = content
+    .trim()
+    .split('\n')
+    .map((l) => JSON.parse(l));
+  return { meta: raw[0] as FixtureMeta, lines: raw.slice(1) as FixtureLine[] };
+}
+
+export interface ReplayTerminal {
+  hybrid: XtermTerminal;
+  term: Terminal;
+  write(data: string): Promise<void>;
+  cursorRowText(): string;
+  rowText(viewportRow: number): string;
+  spanCount(): number;
+  spans(): HTMLSpanElement[];
+  cleanup(): void;
+}
+
+export function createReplayTerminal(cols: number, rows: number): ReplayTerminal {
+  const term = new Terminal({ cols, rows, scrollback: 2000, allowProposedApi: true });
+
+  const element = document.createElement('div');
+  element.className = 'terminal xterm';
+  const screen = document.createElement('div');
+  screen.className = 'xterm-screen';
+  const rowsEl = document.createElement('div');
+  rowsEl.className = 'xterm-rows';
+  element.appendChild(screen);
+  screen.appendChild(rowsEl);
+  document.body.appendChild(element);
+
+  const hybrid = {
+    element,
+    get cols() {
+      return term.cols;
+    },
+    get rows() {
+      return term.rows;
+    },
+    options: { fontFamily: 'monospace', fontSize: 14, fontWeight: 'normal', theme: {} },
+    buffer: {
+      active: {
+        get viewportY() {
+          return term.buffer.active.viewportY;
+        },
+        get baseY() {
+          return term.buffer.active.baseY;
+        },
+        get cursorX() {
+          return term.buffer.active.cursorX;
+        },
+        get cursorY() {
+          return term.buffer.active.cursorY;
+        },
+        getLine: (y: number) => term.buffer.active.getLine(y),
+      },
+    },
+    onWriteParsed: (cb: () => void) => term.onWriteParsed(cb),
+    onResize: (cb: (s: { cols: number; rows: number }) => void) => term.onResize(cb),
+    _core: {
+      _renderService: {
+        dimensions: {
+          css: { cell: { width: CELL_W, height: CELL_H } },
+          device: { char: { top: 0, height: CELL_H } },
+        },
+      },
+    },
+  };
+
+  return {
+    hybrid: hybrid as unknown as XtermTerminal,
+    term,
+    write: (data: string) => new Promise<void>((resolve) => term.write(data, () => resolve())),
+    cursorRowText() {
+      const b = term.buffer.active;
+      return b.getLine(b.baseY + b.cursorY)?.translateToString(true) ?? '';
+    },
+    rowText(viewportRow: number) {
+      const b = term.buffer.active;
+      return b.getLine(b.baseY + viewportRow)?.translateToString(true) ?? '';
+    },
+    spanCount() {
+      return element.querySelectorAll('[data-predictive-echo] span').length;
+    },
+    spans() {
+      return Array.from(element.querySelectorAll('[data-predictive-echo] span')) as HTMLSpanElement[];
+    },
+    cleanup() {
+      term.dispose();
+      element.remove();
+    },
+  };
+}
+
+// ─── Codeman-side mirrors (keep in sync with terminal-ui.js) ────────────
+
+/** Mirror of window.CodemanTerminalInput.classifyPredictInput. */
+export function classifyPredictInput(data: string): 'char' | 'backspace' | 'clear' | 'text' {
+  const cps = Array.from(data);
+  if (cps.length === 1) {
+    const cp = cps[0].codePointAt(0)!;
+    if (cp === 0x7f) return 'backspace';
+    if (cp >= 0x20) return 'char';
+    return 'clear';
+  }
+  if (data.charCodeAt(0) === 0x1b) return 'clear';
+  if (data.charCodeAt(0) >= 0x20) return 'text';
+  return 'clear';
+}
+
+/** Mirror of the codex composer-row gate (CODEX_COMPOSER_ROW_RE). */
+export const CODEX_COMPOSER_ROW_RE = /^› /;
+
+export function codexComposerGate(terminal: XtermTerminal): boolean {
+  try {
+    const buf = terminal.buffer.active;
+    const line = buf.getLine(buf.baseY + (buf.cursorY ?? 0));
+    return !!line && CODEX_COMPOSER_ROW_RE.test(line.translateToString(true));
+  } catch {
+    return false;
+  }
+}

packages/xterm-zerolag-input/tsup.config.ts

@@ -26,6 +26,13 @@ export default defineConfig([
         '      this.activate(terminal);',
         '    }',
         '  };',
+        '  window.PredictiveEchoAddon=XtermZerolagInput.PredictiveEchoAddon;',
+        '  window.PredictiveEchoOverlay=class extends XtermZerolagInput.PredictiveEchoAddon{',
+        '    constructor(terminal){',
+        '      super({});',
+        '      this.activate(terminal);',
+        '    }',
+        '  };',
         '}',
       ].join('\n'),
     },

scripts/build.mjs

@@ -65,6 +65,22 @@ appendFileSync(
   '}\n'
 );
 
+// Predictive echo (codex): separate bundle so the zerolag bundle stays byte-identical
+run('xterm-predictive-echo', 'npx esbuild packages/xterm-zerolag-input/src/predictive-echo-addon.ts --bundle --minify --format=iife --global-name=XtermPredictiveEcho --outfile=dist/web/public/vendor/xterm-predictive-echo.js');
+appendFileSync(
+  join(ROOT, 'dist/web/public/vendor/xterm-predictive-echo.js'),
+  '\n// Global aliases for browser usage\n' +
+  'if(typeof window!=="undefined"){' +
+    'window.PredictiveEchoAddon=XtermPredictiveEcho.PredictiveEchoAddon;' +
+    'window.PredictiveEchoOverlay=class extends XtermPredictiveEcho.PredictiveEchoAddon{' +
+      'constructor(terminal){' +
+        'super({});' +
+        'this.activate(terminal);' +
+      '}' +
+    '};' +
+  '}\n'
+);
+
 // 4. Minify frontend assets
 run('minify input-cjk.js', 'npx esbuild dist/web/public/input-cjk.js --minify --outfile=dist/web/public/input-cjk.js --allow-overwrite');
 run('minify i18n.js', 'npx esbuild dist/web/public/i18n.js --minify --outfile=dist/web/public/i18n.js --allow-overwrite');
@@ -106,6 +122,7 @@ console.log('\n[build] content-hash cache busting');
     'subagent-windows.js',
     'image-input.js',
     'vendor/xterm-zerolag-input.js',
+    'vendor/xterm-predictive-echo.js',
   ];
   const manifest = {};
   for (const file of HASHABLE) {

scripts/dev/analyze-codex-frames.mjs

@@ -0,0 +1,57 @@
+#!/usr/bin/env node
+/**
+ * @fileoverview Replays a codex fixture (recorded by record-codex-frames.mjs)
+ * through @xterm/headless and prints the measurements the predictive-echo
+ * design doc records: cursor position + composer-row text at every keystroke
+ * injection point, and the final screen with cursor + baseY state.
+ *
+ * Usage: node scripts/dev/analyze-codex-frames.mjs <fixture.jsonl>
+ */
+import { readFileSync } from 'node:fs';
+import { createRequire } from 'node:module';
+
+const require = createRequire(import.meta.url);
+const { Terminal } = require('@xterm/headless');
+
+const file = process.argv[2];
+if (!file) throw new Error('usage: analyze-codex-frames.mjs <fixture.jsonl>');
+const lines = readFileSync(file, 'utf8').trim().split('\n').map(JSON.parse);
+const meta = lines.shift();
+console.log('meta:', JSON.stringify(meta));
+
+const term = new Terminal({ cols: meta.cols, rows: meta.rows, scrollback: 1000, allowProposedApi: true });
+const write = (data) => new Promise((r) => term.write(data, r));
+
+const snap = () => {
+  const buf = term.buffer.active;
+  const row = buf.getLine(buf.baseY + buf.cursorY);
+  return {
+    cursorX: buf.cursorX,
+    cursorY: buf.cursorY,
+    baseY: buf.baseY,
+    rowText: row ? row.translateToString(true) : null,
+    cursorCell: row?.getCell?.(buf.cursorX)?.getChars() ?? null,
+  };
+};
+
+for (const line of lines) {
+  if (line.keyAt) {
+    const s = snap();
+    console.log(`KEY ${JSON.stringify(line.data)} @ cursor(${s.cursorX},${s.cursorY}) baseY=${s.baseY}`);
+    console.log(`    row: ${JSON.stringify(s.rowText)}`);
+    console.log(`    cell-at-cursor: ${JSON.stringify(s.cursorCell)}`);
+  } else {
+    await write(line.data);
+  }
+}
+
+const final = snap();
+console.log('\nFINAL screen (| marks cursor row/col):');
+const buf = term.buffer.active;
+for (let y = 0; y < meta.rows; y++) {
+  const line = buf.getLine(buf.baseY + y);
+  let text = line ? line.translateToString(true) : '';
+  if (y === final.cursorY) text = text.slice(0, final.cursorX) + '|' + text.slice(final.cursorX);
+  if (text.trim()) console.log(String(y).padStart(3), JSON.stringify(text));
+}
+console.log('cursor:', JSON.stringify(final), 'viewportY:', buf.viewportY);

scripts/dev/record-codex-frames.mjs

@@ -0,0 +1,218 @@
+#!/usr/bin/env node
+/**
+ * @fileoverview Records real codex TUI output into JSONL fixtures for the
+ * predictive-echo replay tests (packages/xterm-zerolag-input/test/codex-replay.test.ts).
+ *
+ * The pipeline reproduces production byte-for-byte: codex runs inside tmux
+ * (status off, like tmux-manager.ts sessions) driven through a node-pty client,
+ * and every chunk passes through the SAME full strip session.ts applies to
+ * codex-mode output (alt-screen toggles, \x1b[3J, mouse DECSETs, with the
+ * split-sequence carry). What lands in the fixture is what xterm.js receives.
+ *
+ * Fixture format: line 1 is a meta object {scenario, cols, rows, codexVersion,
+ * recordedAt}; every following line is {delayMs, data} where delayMs is the gap
+ * since the previous chunk and data is the stripped chunk. Keystroke injection
+ * points are recorded as {keyAt: true, data} lines so the replay knows where
+ * predictChar() calls belong.
+ *
+ * Usage: node scripts/dev/record-codex-frames.mjs <scenario|all> [--out <dir>]
+ * Scenarios: type-hello, slash-picker, wrap, streaming-burst, paste-bracketed
+ *
+ * The CODEX_HOME is a throwaway temp dir with a fake auth.json; the fake key is
+ * asserted absent from every recorded byte before the fixture is written.
+ */
+import pty from 'node-pty';
+import { execSync } from 'node:child_process';
+import { mkdtempSync, writeFileSync, mkdirSync, rmSync } from 'node:fs';
+import { join, dirname } from 'node:path';
+import { fileURLToPath } from 'node:url';
+
+const ROOT = join(dirname(fileURLToPath(import.meta.url)), '..', '..');
+const FAKE_KEY = 'sk-test-123';
+const COLS = 100;
+const ROWS = 30;
+const BOOT_WAIT_MS = 4500;
+// NOT under /tmp: codex prints a "Refusing to create helper binaries under
+// temporary dir" warning that embeds the CODEX_HOME path when it lives in /tmp.
+// The repo's gitignored tmp/ avoids both the warning and the path leak.
+const SCRATCH = join(ROOT, 'tmp');
+
+// Mirror of the codex-mode FULL strip in session.ts _handleTerminalOutput().
+function makeStripper() {
+  let carry = '';
+  return (data) => {
+    data = carry + data;
+    carry = '';
+    const splitTail = data.match(/\x1b(?:\[\??[0-9]{0,4})?$/);
+    if (splitTail) {
+      carry = splitTail[0];
+      data = data.slice(0, -splitTail[0].length);
+    }
+    return data
+      .replace(/\x1b\[\?(?:47|1047|1049)[hl]/g, '')
+      .replace(/\x1b\[3J/g, '')
+      .replace(/\x1b\[\?(?:1000|1001|1002|1003|1005|1006|1007)[hl]/g, '');
+  };
+}
+
+// Each step: wait `waitMs` after the previous step, then write `keys` to the pty.
+const SCENARIOS = {
+  'type-hello': [
+    ...'hello'.split('').map((ch, i) => ({ waitMs: i === 0 ? BOOT_WAIT_MS : 90, keys: ch })),
+    { waitMs: 1500, keys: '' },
+  ],
+  'slash-picker': [
+    { waitMs: BOOT_WAIT_MS, keys: '/' },
+    { waitMs: 400, keys: 'm' },
+    { waitMs: 150, keys: 'o' },
+    { waitMs: 1200, keys: '\x1b' },
+    { waitMs: 500, keys: '' },
+  ],
+  wrap: [
+    { waitMs: BOOT_WAIT_MS, keys: '' },
+    ...'the quick brown fox jumps over the lazy dog and keeps running until the composer box has to wrap this line twice over'
+      .split('')
+      .map((ch) => ({ waitMs: 25, keys: ch })),
+    { waitMs: 1500, keys: '' },
+  ],
+  'streaming-burst': [
+    ...'hello'.split('').map((ch, i) => ({ waitMs: i === 0 ? BOOT_WAIT_MS : 40, keys: ch })),
+    { waitMs: 300, keys: '\r' },
+    { waitMs: 5000, keys: '' },
+  ],
+  'paste-bracketed': [
+    { waitMs: BOOT_WAIT_MS, keys: 'a' },
+    { waitMs: 90, keys: 'b' },
+    { waitMs: 400, keys: '\x1b[200~XYZpasted\x1b[201~' },
+    { waitMs: 1500, keys: '' },
+  ],
+  // REAL-AUTH streaming (CODEX_RECORD_REAL=1 only): a genuine model response
+  // streaming above the pinned composer while keystrokes land mid-stream.
+  // This is the one shape the fake-key lab can never produce: real output
+  // pushes lines to history (baseY grows), exercising the no-drop-on-baseY
+  // rule against reality. Uses the user's real ~/.codex; the fixture is
+  // secret-scanned (sk- / JWT prefixes) before it is written.
+  'streaming-real': {
+    realAuth: true,
+    steps: [
+      { waitMs: BOOT_WAIT_MS, keys: '\r' }, // trust dialog (untrusted workdir)
+      { waitMs: 2500, keys: '' },
+      ...'reply with the single word hello'.split('').map((ch) => ({ waitMs: 15, keys: ch })),
+      { waitMs: 400, keys: '\r' },
+      { waitMs: 4000, keys: 'a' }, // typed MID-STREAM
+      { waitMs: 120, keys: 'b' },
+      { waitMs: 120, keys: 'c' },
+      { waitMs: 14000, keys: '' },
+    ],
+  },
+  // First-run trust dialog: the modal surface where typed chars must NOT be
+  // predicted (the predictWhen ghost eliminator). Recorded UNTRUSTED so the
+  // dialog actually appears; 'x' exercises typing at a non-composer cursor.
+  'trust-modal': {
+    trusted: false,
+    steps: [
+      { waitMs: BOOT_WAIT_MS, keys: 'x' },
+      { waitMs: 800, keys: '\r' },
+      { waitMs: 2500, keys: '' },
+    ],
+  },
+};
+
+async function record(scenario, outDir) {
+  const spec = SCENARIOS[scenario];
+  if (!spec) throw new Error(`unknown scenario ${scenario}`);
+  const steps = Array.isArray(spec) ? spec : spec.steps;
+  const trusted = Array.isArray(spec) ? true : (spec.trusted ?? true);
+  const realAuth = Array.isArray(spec) ? false : (spec.realAuth ?? false);
+  if (realAuth && process.env.CODEX_RECORD_REAL !== '1') {
+    console.log(`${scenario}: SKIPPED (needs CODEX_RECORD_REAL=1 and a real ~/.codex login)`);
+    return;
+  }
+
+  mkdirSync(SCRATCH, { recursive: true });
+  const lab = mkdtempSync(join(SCRATCH, 'codexrec-'));
+  const workdir = mkdtempSync(join(SCRATCH, 'codexrec-work-'));
+  if (!realAuth) {
+    writeFileSync(join(lab, 'auth.json'), JSON.stringify({ OPENAI_API_KEY: FAKE_KEY }));
+    if (trusted) {
+      // Pre-trust the workdir so boot goes straight to the composer instead of
+      // the first-run trust dialog (which trust-modal records deliberately).
+      writeFileSync(join(lab, 'config.toml'), `[projects."${workdir}"]\ntrust_level = "trusted"\n`);
+    }
+  }
+  const sock = `codexrec-${process.pid}`;
+  const codexVersion = execSync('codex --version', { encoding: 'utf8' }).trim();
+
+  const lines = [];
+  const strip = makeStripper();
+  let lastChunkAt = null;
+  let recording = true;
+  const proc = pty.spawn(
+    'tmux',
+    ['-L', sock, '-f', '/dev/null', 'new-session', '-s', 'rec', ';', 'set', '-t', 'rec', 'status', 'off'],
+    {
+      name: 'xterm-256color',
+      cols: COLS,
+      rows: ROWS,
+      cwd: workdir,
+      env: realAuth ? { ...process.env, SHELL: '/bin/bash' } : { ...process.env, CODEX_HOME: lab, SHELL: '/bin/bash' },
+    }
+  );
+  proc.onData((data) => {
+    if (!recording) return; // teardown frames ([server exited]) stay out
+    const now = performance.now();
+    const stripped = strip(data);
+    if (!stripped) return; // timing folds into the next chunk's delay
+    lines.push({ delayMs: lastChunkAt === null ? 0 : Math.round(now - lastChunkAt), data: stripped });
+    lastChunkAt = now;
+  });
+
+  // tmux session starts with a shell; launch codex in it so the strip pipeline
+  // sees the same attach-then-launch order production uses.
+  await sleep(700);
+  proc.write(`exec codex\r`);
+
+  for (const step of steps) {
+    await sleep(step.waitMs);
+    if (step.keys) {
+      lines.push({ keyAt: true, data: step.keys });
+      proc.write(step.keys);
+    }
+  }
+
+  recording = false;
+  try {
+    execSync(`tmux -L ${sock} kill-server`, { stdio: 'ignore' });
+  } catch {
+    /* already gone */
+  }
+  proc.kill();
+  await sleep(200);
+
+  const allBytes = lines.map((l) => l.data).join('');
+  if (allBytes.includes(FAKE_KEY)) throw new Error(`fixture ${scenario} leaked the fake key; NOT writing`);
+  if (allBytes.includes(lab)) throw new Error(`fixture ${scenario} leaked the lab path; NOT writing`);
+  if (realAuth && /sk-[A-Za-z0-9_-]{8}|eyJ[A-Za-z0-9_-]{20}/.test(allBytes))
+    throw new Error(`fixture ${scenario} may contain credential material; NOT writing`);
+
+  mkdirSync(outDir, { recursive: true });
+  const meta = { scenario, cols: COLS, rows: ROWS, codexVersion, recordedAt: new Date().toISOString() };
+  const out = join(outDir, `${scenario}.jsonl`);
+  writeFileSync(out, [JSON.stringify(meta), ...lines.map((l) => JSON.stringify(l))].join('\n') + '\n');
+  rmSync(lab, { recursive: true, force: true });
+  rmSync(workdir, { recursive: true, force: true });
+  console.log(`${scenario}: ${lines.length} lines -> ${out}`);
+}
+
+function sleep(ms) {
+  return new Promise((r) => setTimeout(r, ms));
+}
+
+const arg = process.argv[2];
+const outIdx = process.argv.indexOf('--out');
+const outDir =
+  outIdx !== -1 ? process.argv[outIdx + 1] : join(ROOT, 'packages', 'xterm-zerolag-input', 'test', 'fixtures', 'codex');
+const wanted = arg === 'all' || !arg ? Object.keys(SCENARIOS) : [arg];
+for (const s of wanted) {
+  await record(s, outDir);
+}

scripts/postinstall.js

@@ -304,6 +304,35 @@ if (isGlobalInstall) {
         } catch {
             console.log(colors.yellow('⚠ Failed to bundle xterm-zerolag-input — overlay may not work in dev mode'));
         }
+
+        // Predictive echo (codex): SEPARATE bundle so the zerolag bundle above stays
+        // byte-identical. If this file is missing or broken, codex simply falls back
+        // to plain PTY echo (pre-predictive behavior); nothing else is affected.
+        try {
+            const predSrc = join(import.meta.dirname, '..', 'packages', 'xterm-zerolag-input', 'src', 'predictive-echo-addon.ts');
+            const predOut = join(vendorDir, 'xterm-predictive-echo.js');
+            execSync(
+                `npx esbuild "${predSrc}" --bundle --format=iife --global-name=XtermPredictiveEcho --outfile="${predOut}"`,
+                { stdio: 'pipe' }
+            );
+            const { appendFileSync } = await import('fs');
+            appendFileSync(
+                predOut,
+                '\n// Global aliases for browser usage\n' +
+                'if(typeof window!=="undefined"){' +
+                    'window.PredictiveEchoAddon=XtermPredictiveEcho.PredictiveEchoAddon;' +
+                    'window.PredictiveEchoOverlay=class extends XtermPredictiveEcho.PredictiveEchoAddon{' +
+                        'constructor(terminal){' +
+                            'super({});' +
+                            'this.activate(terminal);' +
+                        '}' +
+                    '};' +
+                '}\n'
+            );
+            console.log(colors.green('✓ xterm-predictive-echo bundled to vendor/'));
+        } catch (e) {
+            console.log(colors.yellow('⚠ predictive-echo bundle failed (codex uses plain echo): ' + e.message));
+        }
     } catch (err) {
         hasWarnings = true;
         console.log(colors.yellow('⚠ Failed to copy xterm vendor files'));

scripts/prepare-test-vendor.mjs

@@ -0,0 +1,254 @@
+#!/usr/bin/env node
+/**
+ * Populate `src/web/public/vendor/` with the browser bundles the mobile tests need.
+ *
+ * The mobile suite (test/mobile/**) drives a real browser against a WebServer
+ * started from TypeScript source, so fastify-static serves
+ * `join(__dirname, 'public')` = `src/web/public`, NOT `dist/web/public`, where
+ * `npm run build` puts the vendor bundles. Without them every `/vendor/xterm*`
+ * request 404s, so `Terminal` is never defined, `initTerminal()` never runs, and
+ * every test touching `app.terminal` dies with `Cannot read properties of null`.
+ *
+ * That stayed invisible because config/vitest.ci.config.ts excludes
+ * `test/mobile/**`, so CI never ran the suite.
+ *
+ * ⚠️ scripts/postinstall.js:238-303 already writes these same 7 outputs (same
+ * names, same alias tail), so a plain `npm install` leaves the suite working. What
+ * this script adds is FRESHNESS and independence from install time: a checkout
+ * installed with `--ignore-scripts`, or one borrowing another tree's
+ * `node_modules`, never ran postinstall, and an edit to the zerolag package after
+ * install leaves the bundle stale. It runs as `pretest:mobile`.
+ *
+ * Mirrors the vendor steps in scripts/build.mjs, targeting the source tree. Same
+ * inputs and output names, so the page markup needs no test-only branch. That
+ * makes THREE hand-synced copies of this asset table (here, build.mjs:45-51,
+ * postinstall.js:255-303); keep them in step or a missing entry becomes a 404 that
+ * silently disables the terminal.
+ * `src/web/public/vendor/` is gitignored, so these stay build artifacts.
+ *
+ * Idempotent: skips outputs that are complete and newer than every input they
+ * derive from.
+ */
+import { execFileSync } from 'node:child_process';
+import {
+  appendFileSync,
+  copyFileSync,
+  existsSync,
+  mkdirSync,
+  readFileSync,
+  readdirSync,
+  renameSync,
+  rmSync,
+  statSync,
+} from 'node:fs';
+import { dirname, join, resolve } from 'node:path';
+import { fileURLToPath } from 'node:url';
+
+const ROOT = resolve(dirname(fileURLToPath(import.meta.url)), '..');
+const OUT = join(ROOT, 'src', 'web', 'public', 'vendor');
+const NM = join(ROOT, 'node_modules');
+
+/**
+ * Every `vendor/` asset index.html requests, minus the two already committed
+ * (dompurify, marked). Kept in sync with scripts/build.mjs steps 3-4 — a missing
+ * entry here is a 404 that silently disables the terminal in tests.
+ *
+ * mode: 'copy' | 'minify' | 'bundle'
+ */
+const ASSETS = [
+  { src: join(NM, '@xterm/xterm/css/xterm.css'), out: 'xterm.css', mode: 'copy' },
+  { src: join(NM, '@xterm/xterm/lib/xterm.js'), out: 'xterm.min.js', mode: 'minify' },
+  { src: join(NM, '@xterm/addon-fit/lib/addon-fit.js'), out: 'xterm-addon-fit.min.js', mode: 'minify' },
+  {
+    src: join(NM, '@xterm/addon-serialize/lib/addon-serialize.js'),
+    out: 'xterm-addon-serialize.min.js',
+    mode: 'minify',
+  },
+  {
+    src: join(NM, '@xterm/addon-unicode11/lib/addon-unicode11.js'),
+    out: 'xterm-addon-unicode11.min.js',
+    mode: 'minify',
+  },
+  { src: join(NM, '@xterm/addon-webgl/lib/addon-webgl.js'), out: 'xterm-addon-webgl.min.js', mode: 'copy' },
+  {
+    src: join(ROOT, 'packages/xterm-zerolag-input/src/zerolag-input-addon.ts'),
+    out: 'xterm-zerolag-input.js',
+    mode: 'bundle',
+    globalName: 'XtermZerolagInput',
+    // The alias tail appended below. Its absence means the output is a partial
+    // write from an older version of this script, whatever its mtime says.
+    mustContain: 'window.LocalEchoOverlay',
+  },
+];
+
+/**
+ * Every input an asset is derived from. For the bundle that is the whole package
+ * source dir, not just the entry: esbuild pulls in the entry's siblings, so
+ * comparing against the entry alone reports "up to date" after an edit to
+ * overlay-renderer.ts and the suite then tests a stale overlay. Editing those
+ * siblings is exactly the single-source workflow CLAUDE.md mandates.
+ */
+function sourcesOf(asset) {
+  if (asset.mode !== 'bundle') return [asset.src];
+  const dir = dirname(asset.src);
+  try {
+    return readdirSync(dir)
+      .filter((f) => f.endsWith('.ts'))
+      .map((f) => join(dir, f));
+  } catch {
+    return [asset.src];
+  }
+}
+
+/**
+ * A truncated output is the other half of the poisoned-cache problem, and the one
+ * `mustContain` cannot cover on its own: an interrupted write leaves a SHORT file
+ * carrying a current mtime, which the cache then trusts forever. This script
+ * publishes atomically so it can no longer create one, but postinstall.js:266-303
+ * still writes this same directory in place, so a Ctrl+C during `npm install`
+ * produces exactly that, and a 200-byte xterm.min.js means `Terminal` is undefined
+ * and every test dies on a null `app.terminal`.
+ *
+ * A copy must match its source byte for byte. A derived output is held to a floor
+ * far below the real ratios (0.97-1.00 for the minified assets, 0.51 for the
+ * bundle), so a dependency upgrade cannot trip it while a truncation misses by
+ * orders of magnitude.
+ */
+const MIN_DERIVED_RATIO = 0.1;
+
+function isCompleteSize(asset, dest) {
+  const srcBytes = statSync(asset.src).size;
+  const destBytes = statSync(dest).size;
+  if (asset.mode === 'copy') return destBytes === srcBytes;
+  return destBytes >= srcBytes * MIN_DERIVED_RATIO;
+}
+
+function isFresh(asset, dest) {
+  if (!existsSync(dest)) return false;
+  try {
+    // Size and content checks before the mtime check, because mtime cannot see a
+    // WRONG file.
+    if (!isCompleteSize(asset, dest)) return false;
+    // The atomic rename below stops this script from ever publishing a half-written
+    // bundle, but it cannot repair one already on disk: anyone who ran an earlier
+    // version that appended the aliases in place has a complete-looking file with a
+    // current mtime and no alias tail, and a pure mtime cache calls that "up to
+    // date" forever while the suite dies on `LocalEchoOverlay is not defined`.
+    if (asset.mustContain && !readFileSync(dest, 'utf-8').includes(asset.mustContain)) return false;
+    const destMs = statSync(dest).mtimeMs;
+    return sourcesOf(asset).every((src) => destMs >= statSync(src).mtimeMs);
+  } catch {
+    // an unreadable or vanished input: rebuild rather than trust the cache
+    return false;
+  }
+}
+
+mkdirSync(OUT, { recursive: true });
+
+// A run killed between its build and its rename leaks a temp, and the per-pid
+// names above mean nothing reclaims it later. Sweep the ones whose owning process
+// is gone, and ONLY those: deleting a live run's temp is the collision the per-pid
+// name exists to prevent. `kill(pid, 0)` throws ESRCH only when no such process
+// exists (EPERM means it does, owned by someone else, so leave it alone).
+for (const name of readdirSync(OUT)) {
+  const owner = /\.(\d+)\.tmp$/.exec(name);
+  const pid = owner ? Number(owner[1]) : 0;
+  // 0 is never a real owner: to kill(2) it means "this process group".
+  if (!pid) continue;
+  try {
+    process.kill(pid, 0);
+  } catch (err) {
+    // ESRCH alone means the owner is gone. Anything else (EPERM = alive under
+    // another user, a pid too large to be valid) leaves the file where it is.
+    if (err.code !== 'ESRCH') continue;
+    try {
+      rmSync(join(OUT, name), { force: true });
+    } catch {
+      // Reclaiming litter must never fail the run: a leftover temp is inert
+      // (gitignored, referenced by nothing), a crashed prepare step is not.
+    }
+  }
+}
+
+let built = 0;
+let skipped = 0;
+for (const asset of ASSETS) {
+  const dest = join(OUT, asset.out);
+  if (!existsSync(asset.src)) {
+    console.error(`[test-vendor] missing input: ${asset.src}\n  run \`npm install\` first`);
+    process.exit(1);
+  }
+  if (isFresh(asset, dest)) {
+    skipped += 1;
+    continue;
+  }
+  // Build into a temp path and rename into place at the very end. The zerolag
+  // bundle is finished by a SECOND step (the alias append below), so writing
+  // `dest` directly leaves a window where a complete-looking file with a current
+  // mtime is missing its tail: `isFresh` then reports "up to date" forever and the
+  // suite dies on `LocalEchoOverlay is not defined`, which is the exact failure
+  // this script exists to prevent. An interrupted esbuild or copy poisons the
+  // cache the same way. rename(2) is atomic within a directory, so a reader sees
+  // either the old file or the finished new one, never a half-written one.
+  // The name carries our pid: the path must be private to this run. Two runs
+  // sharing one temp path fight over it, and losing that fight is not just a
+  // crash — a sibling's `rmSync` landing between the esbuild and the append below
+  // makes appendFileSync CREATE the file, so the rename publishes a bundle-less
+  // file consisting only of the alias tail. That file still contains
+  // `mustContain`, so the cache would bless it forever.
+  const tmp = `${dest}.${process.pid}.tmp`;
+  rmSync(tmp, { force: true });
+  // cwd: ROOT so `npx` resolves the repo's pinned esbuild. Without it a run from
+  // another directory misses the local install and fetches an unpinned one.
+  const run = (args) => execFileSync('npx', args, { stdio: 'inherit', cwd: ROOT });
+  try {
+    if (asset.mode === 'copy') {
+      copyFileSync(asset.src, tmp);
+    } else if (asset.mode === 'minify') {
+      run(['esbuild', asset.src, '--minify', `--outfile=${tmp}`]);
+    } else {
+      run([
+        'esbuild',
+        asset.src,
+        '--bundle',
+        '--minify',
+        '--format=iife',
+        `--global-name=${asset.globalName}`,
+        `--outfile=${tmp}`,
+      ]);
+    }
+
+    // The zerolag bundle exports only `XtermZerolagInput`. app.js constructs
+    // `new LocalEchoOverlay(terminal)` directly, so scripts/build.mjs appends
+    // global aliases after esbuild — without them initTerminal() throws
+    // `LocalEchoOverlay is not defined` at the point it builds the overlay, and
+    // every later step (including the mobile touch handlers) silently never runs.
+    if (asset.out === 'xterm-zerolag-input.js') {
+      appendFileSync(
+        tmp,
+        '\n// Global aliases for browser usage\n' +
+          'if(typeof window!=="undefined"){' +
+          'window.ZerolagInputAddon=XtermZerolagInput.ZerolagInputAddon;' +
+          'window.LocalEchoOverlay=class extends XtermZerolagInput.ZerolagInputAddon{' +
+          'constructor(terminal){' +
+          'super({prompt:{type:"character",char:"\\u276f",offset:2}});' +
+          'this.activate(terminal);' +
+          '}' +
+          '};' +
+          '}\n'
+      );
+    }
+
+    // Only now is the output complete, so publish it. The append and the rename
+    // are inside this try as well: a failure there has to clean the temp up and
+    // report like any other, not leak it behind a raw stack trace.
+    renameSync(tmp, dest);
+  } catch (err) {
+    rmSync(tmp, { force: true });
+    console.error(`[test-vendor] failed to produce ${asset.out} from ${asset.src}\n  ${err.message}`);
+    process.exit(1);
+  }
+  built += 1;
+}
+
+console.log(`[test-vendor] ${built} built, ${skipped} up to date -> src/web/public/vendor/`);

skills/codeman/SKILL.md

@@ -158,7 +158,16 @@ You are yourself a session on this server, and the API has **no undo**.
   `{"success":false,"error","errorCode"}`. Read `.data`. Use `/api/v1/*` paths.
 - **A wait timeout is HTTP 200**, `{wait:{timedOut:true,signal:null}}` — not an error.
   Loop over short waits (60 s); proxies cut long-idle connections. Timeouts are
-  **clamped** (ceiling 600 s): read back `wait.timeoutMs` for what was applied.
+  **clamped** (ceiling 600 s): read back `wait.timeoutMs` for what was applied. The
+  clamp covers positive integers only: `0`, a negative, a fraction or `30s` is a 400,
+  so round any computed remainder and drop it entirely rather than sending zero.
+- **Never branch on `.data.status`.** It is a heuristic and is often wrong in both
+  directions: measured on a live claude worker reading `idle` while it was mid-turn
+  and actively producing output (`lastActivityAt` equal to the moment of the call),
+  and a worker that died inside its pane also reads `idle`. Synchronize on `stop` via
+  send-and-wait, or on an output marker. To judge from outside, sample
+  `terminal?tail=` twice a few seconds apart: a changing buffer is the only cheap
+  positive proof a worker is still working. `wait?until=exit` is the death check.
 - **`stop` and `blocked` fire for `claude` sessions only** (Claude Code hooks). On
   `shell`/`opencode`/`codex`/`gemini`/`antigravity`, requesting them explicitly is a
   400 — and lifecycle transitions there are coarse (a short shell command may emit
@@ -191,10 +200,35 @@ contains `❯` too — observed live). Codeman *can* auto-accept that dialog its
 the accept rides a stream match that misses on some runs (both outcomes seen live),
 so wait for the composer first and handle the dialog only as the bounded fallback —
 never send a blind Enter up front (if auto-accept already fired, it lands in the
-composer). Stage 1 is short on purpose: an already-trusted case matches `bypass` in
+composer). Stage 1 is short on purpose: an already-trusted case matches `shift+tab` in
 under a second, while a **virgin case can never pass stage 1** (the dialog is up, so
 the composer is not) and always pays it in full before the fallback runs — the long
-budget belongs to stage 3, after the dialog is answered:
+budget belongs to stage 3, after the dialog is answered.
+
+⚠️ **Match `shift+tab`, never `bypass`.** The permission mode is a server-side setting
+(`claudeMode`) that is **not** exposed on `GET /api/v1/sessions/:id`, so you cannot read
+which mode a worker runs. `bypass permissions on` is only the DEFAULT mode's statusline.
+Measured against claude-cli 2.1.226, one pane per mode:
+
+| how Codeman spawned it | statusline reads | `shift+tab` | `bypass` |
+|------------------------|------------------|-------------|----------|
+| `--dangerously-skip-permissions` (default) | `bypass permissions on` | yes | yes |
+| `--permission-mode auto` | `auto mode on` | yes | no |
+| `--allowedTools …` | `don't ask on` | yes | no |
+| neither (`normal`) | `don't ask on` | yes | no |
+
+Every mode ends its status bar with `(shift+tab to cycle)`, so `shift+tab` is the one
+token that means "the composer is up" regardless of mode, and it is space-free, which is
+what makes it survive the TUI stream. Matching `bypass` instead reports a perfectly
+healthy non-default worker as broken after burning the full ladder.
+
+⚠️ **`shift+tab` contains a `+`, so it MUST go through `--data-urlencode`.** In a
+hand-built query the `+` decodes to a space and the server searches for `shift tab`,
+which never appears (measured: `matched:false`, and the response echoes back
+`match: "shift tab"`, which is how you spot it).
+
+Stage 4 stays as the last resort for the case where even that misses: a worker that
+answers a trivial prompt **is** ready, whatever its statusline reads.
 
 ```bash
 # ALWAYS check .success: on failure `.data.sessionId` is null, jq -r prints the string
@@ -216,10 +250,11 @@ done
 # its pane keeps status "idle" and a pid (the local tmux attach client, not the
 # worker). The death check is wait?until=exit, below.
 SEQ=1   # $CID came from the §0 preamble; do NOT rebuild it from $$
-# the composer's status bar ("bypass permissions on") is the ready marker — Codeman
-# spawns claude in bypass mode. Single-token matches only: TUI text is space-less.
+# stage 1-3: `shift+tab` is the composer's status bar in EVERY permission mode (see the
+# table above), so this works whatever `claudeMode` the server runs. Single-token
+# matches only: TUI text is space-less. The `+` needs --data-urlencode.
 R=$("${CURL[@]}" -G "$API/api/v1/sessions/$SID/wait-output" \
-    --data-urlencode 'match=bypass' --data-urlencode 'from=buffer' --data-urlencode 'timeout=5000')
+    --data-urlencode 'match=shift+tab' --data-urlencode 'from=buffer' --data-urlencode 'timeout=5000')
 if ! jq -e '.data.wait.matched' <<<"$R" >/dev/null; then
   # composer never appeared → the trust dialog is probably still up; accept it once
   T=$("${CURL[@]}" -G "$API/api/v1/sessions/$SID/wait-output" \
@@ -230,9 +265,23 @@ if ! jq -e '.data.wait.matched' <<<"$R" >/dev/null; then
     SEQ=$((SEQ+1))
   fi
   R=$("${CURL[@]}" -G "$API/api/v1/sessions/$SID/wait-output" \
-      --data-urlencode 'match=bypass' --data-urlencode 'from=buffer' --data-urlencode 'timeout=45000')
-  jq -e '.data.wait.matched' <<<"$R" >/dev/null || \
-    { echo "worker $SID never became ready; inspect terminal?tail="; }
+      --data-urlencode 'match=shift+tab' --data-urlencode 'from=buffer' --data-urlencode 'timeout=45000')
+fi
+if ! jq -e '.data.wait.matched' <<<"$R" >/dev/null; then
+  # stage 4, last resort: the composer never appeared at all. A miss is still not proof
+  # of a broken worker, and answering is proof that it works. Split the token (your keystrokes echo
+  # into the stream) and keep it unique per call. This costs the worker one turn, so
+  # it runs only after the fast path missed. It must stay AFTER stage 2, which is the
+  # only thing that clears the trust dialog: free text plus \r into a dialog still up
+  # answers it blind, which is the same footgun as the up-front Enter.
+  TOK="${RANDOM}_$$"
+  "${CURL[@]}" -X POST "$API/api/v1/sessions/$SID/input" -H 'Content-Type: application/json' \
+    -d '{"input":"reply with the word READY immediately followed by _'"$TOK"' and nothing else\r","useMux":true,"clientId":"'"$CID"'","seq":'$SEQ'}' >/dev/null
+  SEQ=$((SEQ+1))
+  "${CURL[@]}" -G "$API/api/v1/sessions/$SID/wait-output" \
+    --data-urlencode "match=READY_$TOK" --data-urlencode 'from=buffer' --data-urlencode 'timeout=60000' \
+    | jq -e '.data.wait.matched' >/dev/null \
+    || echo "worker $SID never became ready; inspect terminal?tail="
 fi
 ```
 
@@ -313,8 +362,11 @@ why the loop above is bounded rather than open-ended. Fall back to the terminal
 (`textOutput` in `GET .../output` stays empty for interactive sessions; don't use it):
 
 ```bash
+# \x1b is a GNU-sed extension: BSD sed (macOS) matches it as a literal "x1b", so the
+# same one-liner strips NOTHING there and hands you raw ANSI. Feed sed a real ESC.
+ESC=$(printf '\033')
 "${CURL[@]}" "$API/api/v1/sessions/$SID/terminal?tail=3000" | jq -r '.data.terminalBuffer' \
-  | sed -e 's/\x1b\[[0-9;?]*[a-zA-Z]//g' -e 's/\x1b([B0]//g' | grep -v '^[[:space:]]*$' | tail -30
+  | sed -e "s/${ESC}\[[0-9;?]*[a-zA-Z]//g" -e "s/${ESC}([B0]//g" | grep -v '^[[:space:]]*$' | tail -30
 ```
 
 ⚠️ Do not use that pipeline to read a **claude/codex** answer. A full-screen TUI draws

skills/codeman/reference/endpoints.md

@@ -13,6 +13,7 @@ Every JSON response: `{"success":true,"data":…}` or
 |-------------|------|---------|
 | `INVALID_INPUT` | 400 | malformed request; the message names the bad field |
 | `UNAUTHORIZED` | 401 | auth required or failed (send `-u user:password`). ⚠️ The 401 body is plain text, NOT this envelope — `jq` dies with a parse error, see the guard in SKILL.md |
+| `FORBIDDEN` | 403 | authenticated but not permitted: an admin-only route in multi-user mode, a `workingDir`/case path outside your own workspace, or a shell session without the can-bypass-permissions grant. ⚠️ **Not** what an ownership miss on a session returns: a session you do not own answers 404 `NOT_FOUND`, identically to one that does not exist (deliberate, it leaks no existence) |
 | `NOT_FOUND` | 404 | no such session, or one this caller does not own |
 | `SESSION_BUSY` | 409 | on a **wait**: this session's waiter cap (16, combined signal+output) is full. On **quick-start**: the 50-session cap is full, so clean up before starting more |
 | `CONFLICT` / `ALREADY_EXISTS` | 409 | conflicts with current state |
@@ -23,12 +24,21 @@ Every JSON response: `{"success":true,"data":…}` or
 `SESSION_BUSY` vs `RATE_LIMITED` on the wait endpoints is deliberate: the first means
 "too many waiters on *this* session", the second means the *pool* is full.
 
+⚠️ **The guards that run before any handler answer in PLAIN TEXT, not this envelope**,
+so `jq` reports a parse error and `.errorCode` is simply absent. All of them:
+`401 Unauthorized` (Basic auth, carries `WWW-Authenticate`), `401 Unauthorized: hook
+secret required`, `403 Forbidden: host not allowed` (Host allowlist), `403 Forbidden:
+cross-site request blocked` (Origin/CSRF guard), and the auth rate limiter's
+`429 Too Many Requests` (with `Retry-After`; distinct from the JSON `RATE_LIMITED`
+above, which is the waiter pool). When a call returns something `jq` cannot parse,
+read the status with `-w '%{http_code}'` and the raw body before assuming a bug.
+
 ## Sessions
 
 | Task | Call |
 |------|------|
 | list sessions (metadata only, ~1.5 KB each, safe to poll) | `GET /api/v1/sessions` |
-| one session (has `.data.pid`, `null` until the PTY spawns) | `GET /api/v1/sessions/:id` — ⚠️ **not a liveness check**: a worker that dies inside its pane keeps `status:"idle"` and a pid (the tmux attach client); `wait?until=exit` is the death check |
+| one session (has `.data.pid`, `null` until the PTY spawns) | `GET /api/v1/sessions/:id` — ⚠️ **neither a liveness nor a busy check**, see below |
 | unified list incl. history | `GET /api/v1/sessions/unified` → `.data.sessions[]` (NOT `.data[]`), and it folds in transcript history from the whole machine — never use it to verify cleanup; `GET /api/v1/sessions` is the cleanup check |
 | start case + session in one call | `POST /api/v1/quick-start` |
 | send input | `POST /api/v1/sessions/:id/input` |
@@ -38,7 +48,33 @@ Every JSON response: `{"success":true,"data":…}` or
 | background agents, one session | `GET /api/v1/sessions/:id/subagents` |
 | background agents, global list | `GET /api/v1/subagents` (admin-only in multi-user mode) |
 | server status / version | `GET /api/v1/status` → `.data.version` |
-| delete one session (yours only, via `delete_session`) | `DELETE /api/v1/sessions/:id` — never call it bare; the fail-closed helper in SKILL.md §0 is the only self-protection that exists |
+| delete one session (yours only, via `delete_session`) | `DELETE /api/v1/sessions/:id` — never call it bare; the fail-closed helper in SKILL.md §0 is the only self-protection that exists. Answers `{"success":true,"data":{}}`: an **empty** body is the success signal, there is nothing to read back |
+
+`DELETE /api/v1/sessions/:id` takes one undocumented query parameter, `killMux`, and
+it defaults to `true` (anything other than the exact string `false` means kill). With
+`?killMux=false` the call **detaches instead of killing**: the tmux session and the
+agent inside it keep running, the session drops out of `GET /api/v1/sessions` so it
+looks deleted, and it is deliberately left in persisted state for recovery (the
+lifecycle log records `detached`, not `deleted`). That is the wrong tool for agent
+cleanup: your worker keeps burning tokens where neither you nor the user can see it,
+and the list you would check to confirm cleanup shows it gone. Delete plainly, and let
+`killMux` default.
+
+⚠️ **`.data.status` is a heuristic and is often simply wrong. Never branch on it.**
+Measured on a live claude worker: `status` read `idle` while the worker was mid-turn
+and actively producing output, with `lastActivityAt` equal to the moment of the call.
+It is wrong in both directions, so neither value tells you anything you can act on:
+
+- **`idle` does not mean finished.** Use `stop` (the definitive end-of-turn hook) via
+  send-and-wait, or an output marker. If you must judge from outside, sample
+  `terminal?tail=` twice a few seconds apart and compare: a changing buffer is the
+  only cheap positive proof that a worker is still working.
+- **`idle` does not mean alive.** A worker that dies inside its pane keeps
+  `status:"idle"` and a pid (that pid is the local tmux attach client, not the
+  worker). `wait?until=exit` is the death check.
+
+Treat `status` as a UI hint. Every synchronization decision in these recipes is built
+on signals and markers for exactly this reason.
 
 ⚠️ `GET /api/v1/sessions/:id/output` → `.data.textOutput` looks like the obvious read
 but stays **empty for interactive tmux-backed sessions** (it is fed only by the legacy
@@ -47,7 +83,11 @@ JSON-stream path). Verified empty on live claude and shell sessions. Use
 hook-less modes, or to diagnose a prompt that was never submitted, and strip ANSI:
 
 ```bash
-… | jq -r '.data.terminalBuffer' | sed -e 's/\x1b\[[0-9;?]*[a-zA-Z]//g' -e 's/\x1b([B0]//g'
+# `\x1b` is a GNU-sed extension. BSD sed (macOS, the default there) reads it as a
+# literal "x1b", matches nothing, and hands back raw ANSI, silently. Feed sed a real
+# ESC byte instead; that form works on GNU and BSD alike.
+ESC=$(printf '\033')
+… | jq -r '.data.terminalBuffer' | sed -e "s/${ESC}\[[0-9;?]*[a-zA-Z]//g" -e "s/${ESC}([B0]//g"
 ```
 
 `POST /api/v1/quick-start` body (all optional):
@@ -83,6 +123,12 @@ do want a worker in an existing checkout.
   confirmation at all.
 - `input` must be single-line (newlines are stripped). To send a bare Enter (confirm
   a dialog), send `{"input":"\r"}`.
+- `input` is capped at **100 000 characters**; one character over is a 400
+  `INVALID_INPUT` and **nothing is typed** (the schema rejects the whole body, so it
+  is not a truncation). Since the value is one line anyway, a prompt that big means
+  you are pasting a file into the composer: write it to disk in the worker's case
+  directory and send a path instead. `clientId` is capped at 128 characters on the
+  same terms.
 - `clientId`+`seq` give exactly-once delivery: the server applies each pair at most
   once. Increment `seq` per new input.
 
@@ -94,6 +140,13 @@ Three bounded long-polls. Shared semantics:
   `tailscale serve` / cloudflared cut idle connections.
 - Timeouts are **clamped** to `[1000, 600000]` ms (operator-tunable); the applied
   value is echoed as `wait.timeoutMs` — read it back, never assume.
+- ⚠️ Clamping only covers **positive integers**. `timeout=0`, a negative value, a
+  fraction (`timeout=1500.5`) and anything non-numeric (`timeout=30s`) are rejected by
+  the schema as a 400 `INVALID_INPUT` naming the field, not silently clamped up to
+  the floor. Omit the parameter to take the 60 000 ms default; never send a computed
+  remainder without rounding it and checking it is still above zero. Same rule for
+  `waitTimeout` in the input body, where the value must additionally be a JSON number
+  (a quoted `"60000"` is a 400).
 - All three nest the result under `.data.wait`, same shape, so one helper parses all.
 - `.data.status` (post-wait `SessionStatus`) and `.data.limitPaused` ride along.
   `limitPaused:true` means the session is paused on a usage limit and will emit
@@ -136,7 +189,7 @@ worker that finishes before its gather is unobservable (see recipes.md Flow 3b).
 | Param | Default | Notes |
 |-------|---------|-------|
 | `until` | `stop,idle,exit` | comma list; unknown token → 400 naming it |
-| `timeout` | 60000 | ms, clamped; applied value echoed as `wait.timeoutMs` |
+| `timeout` | 60000 | ms, positive integer only (0/negative/fractional = 400); clamped, applied value echoed as `wait.timeoutMs` |
 | `fresh` | `0` | `1` requires an actual *transition*, ignoring the state at call time |
 
 ⚠️ A session whose PTY has not spawned (`pid:null`) or has exited counts as `exit`
@@ -152,7 +205,7 @@ SKILL.md, not this endpoint.
 | `match` | required | literal substring, 1–200 chars, ANSI-stripped; chunk-straddling matches found; **no regex** — a `regex=` param is a 400 |
 | `nocase` | `0` | case-insensitive compare; snippet keeps original casing |
 | `from` | `now` | `buffer` scans the tail (~256 KB) of existing output first |
-| `timeout` | 60000 | same clamp |
+| `timeout` | 60000 | same clamp, same positive-integer rule |
 
 Four traps, all observed live:
 
@@ -173,7 +226,7 @@ Four traps, all observed live:
    spaced phrase. Whether a given phrase keeps its spaces depends on how the TUI
    drew it (observed live: some multi-word matches fire, some never do), so treat
    multi-word matches against TUI screens as unreliable and match a **single
-   space-free token** (`trust`, `bypass`). Plain command output (shell workers,
+   space-free token** (`trust`, `shift+tab`). Plain command output (shell workers,
    `echo` lines) keeps real spaces and multi-word matches work there.
 
 Build the query with `-G --data-urlencode` (a `+` in a hand-built query decodes to a
@@ -185,7 +238,7 @@ around the match, blank runs collapsed — the snippet is often all you need to
 | Field | Notes |
 |-------|-------|
 | `wait` | `true` (default signal set) or the same comma grammar as `until`; absent = historical fire-and-forget |
-| `waitTimeout` | ms, same clamp |
+| `waitTimeout` | ms, same clamp; a JSON number, positive integer (`"60000"` is a 400) |
 
 Registers the waiter **before** typing, which closes the race where send-then-wait
 sees the previous turn's idle state and returns instantly. Response adds `delivered`
@@ -222,7 +275,9 @@ whose prompt was never submitted (missing `\r`) produces the same
 | connection refused from inside a container | a loopback-bound server is unreachable from a container, and `CODEMAN_DOCKER_BRIDGE_HOOKS=1` does **not** fix that: it opens a hooks-only listener, so hook events start flowing but `/api/v1/*` stays refused. Driving the API from inside a Docker case needs a reachable bind (an operator decision); report it, don't retry |
 | wait routes 404 on a valid session id | read the `.error` text: a `Route ...` prefix means the server predates the wait endpoints (< 1.13.0; a dev build can serve them while reporting an older version, so probe, never version-compare) — poll `terminal?tail=` and say so. `Session ... not found` means your id is wrong, not the server |
 | wait on `stop` never resolves | non-claude mode, or hooks not reaching the server (Docker/remote), or a case created by Codeman < 1.13.0 against an `--https` install (its hook curls lacked `-k` and TLS-failed silently; a 1.13.0+ server rewrites them the next time a session starts in that case). Use markers or `idle,exit` |
-| new claude worker ignores its first prompt | it was showing the first-run trust dialog and Codeman's auto-accept missed; use the readiness recipe in SKILL.md (wait for `bypass` first, accept the dialog only as the bounded fallback) |
+| new claude worker ignores its first prompt | it was showing the first-run trust dialog and Codeman's auto-accept missed; use the readiness recipe in SKILL.md (wait for `shift+tab` first, accept the dialog only as the bounded fallback) |
+| readiness burns its whole budget, then the worker answers fine anyway | you matched `bypass`, which is the statusline of ONE permission mode. Codeman spawns `--dangerously-skip-permissions` by default, but the server's `claudeMode` setting also has `auto` (`auto mode on`), `allowedTools` and `normal` (both `don't ask on`), and the mode is not exposed on `GET /api/v1/sessions/:id`. Match **`shift+tab`** instead: every mode's status bar ends `(shift+tab to cycle)` (measured per mode against claude-cli 2.1.226). ⚠️ It must go through `--data-urlencode`, or the `+` decodes to a space and you silently search for `shift tab`. Expect `blocked` signals mid-turn on the non-default modes |
+| ANSI escapes survive the strip pipeline | `sed -e 's/\x1b…'` on macOS: `\x1b` is GNU-only, BSD sed matches nothing and strips nothing. Use the `ESC=$(printf '\033')` form above |
 | `wait-output` times out although the pane shows the text | multi-word match against a TUI screen; the stream has no spaces there — match one token |
 | `wait-output` matched instantly with stale text | generic marker + tmux repaint; use `DONE_$RANDOM` |
 | 409 `SESSION_BUSY` on a wait | too many concurrent waiters on that session (cap 16 combined); reuse one wait per worker |

skills/codeman/reference/recipes.md

@@ -39,13 +39,20 @@ SEQ=1               # $CID is the fixed literal from §0; never rebuild it from
 #    virgin case can never pass it (the dialog is up) and always pays it in full —
 #    the long budget belongs to stage 3, after the dialog is answered.
 #    Single-token matches only: TUI text is space-less in the stream.
+#    ⚠️ `bypass` is the statusline of ONE permission mode (the default one Codeman
+#    spawns). The server's `claudeMode` setting also has auto/allowedTools/normal
+#    spawns whose statusline differs, and the mode is not exposed on GET
+#    /api/v1/sessions/:id. `shift+tab` is the one token EVERY mode's status bar ends
+#    with ('(shift+tab to cycle)'), measured per mode, so match that and not `bypass`.
+#    The `+` needs --data-urlencode or it decodes to a space. Stage 4 remains the last
+#    resort: proving readiness by making the worker answer rather than by chrome.
 for _ in $(seq 1 30); do
   [ "$("${CURL[@]}" "$API/api/v1/sessions/$SID" | jq '.data.pid')" != null ] && break; sleep 1
 done
 # (pid != null proves startup only — a worker that later dies inside its pane keeps
 #  status "idle" and a pid. The death check is wait?until=exit.)
 R=$("${CURL[@]}" -G "$API/api/v1/sessions/$SID/wait-output" \
-    --data-urlencode 'match=bypass' --data-urlencode 'from=buffer' --data-urlencode 'timeout=5000')
+    --data-urlencode 'match=shift+tab' --data-urlencode 'from=buffer' --data-urlencode 'timeout=5000')
 if ! jq -e '.data.wait.matched' <<<"$R" >/dev/null; then
   T=$("${CURL[@]}" -G "$API/api/v1/sessions/$SID/wait-output" \
       --data-urlencode 'match=trust' --data-urlencode 'from=buffer' --data-urlencode 'timeout=2000')
@@ -55,8 +62,21 @@ if ! jq -e '.data.wait.matched' <<<"$R" >/dev/null; then
     SEQ=$((SEQ+1))
   fi
   R=$("${CURL[@]}" -G "$API/api/v1/sessions/$SID/wait-output" \
-      --data-urlencode 'match=bypass' --data-urlencode 'from=buffer' --data-urlencode 'timeout=45000')
-  jq -e '.data.wait.matched' <<<"$R" >/dev/null || echo "worker $SID not ready; inspect terminal?tail="
+      --data-urlencode 'match=shift+tab' --data-urlencode 'from=buffer' --data-urlencode 'timeout=45000')
+fi
+if ! jq -e '.data.wait.matched' <<<"$R" >/dev/null; then
+  # stage 4, mode-agnostic and bounded: answering a trivial prompt IS readiness.
+  # Costs the worker one turn, so it only runs when the fast marker missed. Split
+  # token (the typed line echoes into the stream) and unique per call. Must stay AFTER
+  # the dialog fallback: free text plus \r into a trust dialog still up answers it
+  # blind, the same footgun as an up-front Enter.
+  TOK="${RANDOM}_$$"
+  "${CURL[@]}" -X POST "$API/api/v1/sessions/$SID/input" -H 'Content-Type: application/json' \
+    -d '{"input":"reply with the word READY immediately followed by _'"$TOK"' and nothing else\r","useMux":true,"clientId":"'"$CID"'","seq":'$SEQ'}' >/dev/null
+  SEQ=$((SEQ+1))
+  "${CURL[@]}" -G "$API/api/v1/sessions/$SID/wait-output" \
+    --data-urlencode "match=READY_$TOK" --data-urlencode 'from=buffer' --data-urlencode 'timeout=60000' \
+    | jq -e '.data.wait.matched' >/dev/null || echo "worker $SID not ready; inspect terminal?tail="
 fi
 
 # 3. send-and-wait, looping on the IDENTICAL request (tagged duplicate: no retype).
@@ -244,13 +264,16 @@ the worker remembering to print a token.
 
 Claude workers can block on a permission dialog. `blocked` is a wait signal
 (claude-mode only), so watch for it and surface the question to the user instead of
-guessing an answer:
+guessing an answer. Expect it routinely on a server whose `claudeMode` is not the
+default bypass one (the same setting that decides whether the readiness marker in
+Flow 1 ever appears):
 
 ```bash
+ESC=$(printf '\033')   # \x1b is GNU-sed only; BSD sed (macOS) would strip nothing
 R=$("${CURL[@]}" "$API/api/v1/sessions/$SID/wait?until=stop,blocked,exit&timeout=60000")
 if [ "$(jq -r '.data.wait.signal' <<<"$R")" = blocked ]; then
   "${CURL[@]}" "$API/api/v1/sessions/$SID/terminal?tail=2000" | jq -r '.data.terminalBuffer' \
-    | sed -e 's/\x1b\[[0-9;?]*[a-zA-Z]//g' | grep -v '^[[:space:]]*$' | tail -15
+    | sed -e "s/${ESC}\[[0-9;?]*[a-zA-Z]//g" | grep -v '^[[:space:]]*$' | tail -15
   # show this to the user and ask how to answer; do NOT auto-confirm another
   # session's permission prompt
 fi

src/cli.ts

@@ -136,7 +136,7 @@ const LINKED_CASES_FILE = dataPath('linked-cases.json');
  * Sync and tolerant on purpose: a missing or malformed registry means "no linked
  * cases", never a crash.
  */
-function resolveCliCasePath(name: string): string {
+export function resolveCliCasePath(name: string): string {
   try {
     const linked = JSON.parse(readFileSync(LINKED_CASES_FILE, 'utf-8')) as Record<string, string>;
     const target = linked?.[name];
@@ -154,17 +154,30 @@ function resolveCliCasePath(name: string): string {
  * `resolveCliCasePath()` above. The web server's automatic per-case injection
  * (`agentSkillEnabled`) covers multi-user spaces; this CLI is a local operator tool
  * and stays single-user.
+ *
+ * A missing case is REPORTED, not exited on: the exit lives in the wrapper below so
+ * this resolution (including the linked-cases lookup, which shipped unguarded) can be
+ * unit-tested without `process.exit(1)` taking the test runner down with it.
  */
-function resolveSkillTarget(options: { case?: string }): string {
+export function resolveSkillTargetPath(options: {
+  case?: string;
+}): { target: string; missingCase?: undefined } | { target?: undefined; missingCase: string } {
   if (options.case) {
     const casePath = resolveCliCasePath(options.case);
-    if (!existsSync(casePath)) {
-      console.error(chalk.red(`✗ Case not found: ${casePath}`));
-      process.exit(1);
-    }
-    return join(casePath, '.claude', 'skills', 'codeman');
+    if (!existsSync(casePath)) return { missingCase: casePath };
+    return { target: join(casePath, '.claude', 'skills', 'codeman') };
   }
-  return join(homedir(), '.claude', 'skills', 'codeman');
+  return { target: join(homedir(), '.claude', 'skills', 'codeman') };
+}
+
+/** Exit-owning wrapper around `resolveSkillTargetPath()` for the two commands below. */
+function resolveSkillTarget(options: { case?: string }): string {
+  const resolved = resolveSkillTargetPath(options);
+  if (resolved.missingCase !== undefined) {
+    console.error(chalk.red(`✗ Case not found: ${resolved.missingCase}`));
+    process.exit(1);
+  }
+  return resolved.target;
 }
 
 /** Print an AgentSkillApplyResult for humans; exit non-zero when nothing was done. */

src/hooks-config.ts

@@ -11,6 +11,7 @@
  * - `generateHooksConfig()` — returns hooks object for settings.local.json
  * - `writeHooksConfig(casePath)` — writes hooks + env config to disk
  * - `ensureCodemanHooks(casePath)` — safely installs/updates hooks for a managed case
+ *   (no production call site yet; see its doc comment before wiring one)
  * - `updateCaseEnvVars(casePath, envVars)` — merges env vars into settings
  *
  * Hook events generated: `idle_prompt`, `permission_prompt`, `elicitation_dialog`,
@@ -26,8 +27,9 @@
  * @module hooks-config
  */
 
+import { randomBytes } from 'node:crypto';
 import { existsSync } from 'node:fs';
-import { readFile, writeFile, mkdir, lstat, readdir, unlink, rmdir } from 'node:fs/promises';
+import { readFile, writeFile, mkdir, lstat, readdir, rename, unlink, rmdir } from 'node:fs/promises';
 import { join, dirname } from 'node:path';
 import { fileURLToPath } from 'node:url';
 
@@ -41,6 +43,9 @@ import { HOOK_TIMEOUT_SECONDS } from './config/auth-config.js';
  * while an App-Settings toggle injects the statusLine into the same repo — can't
  * lose each other's changes through interleaved read-then-write. Per-path chains
  * are independent; the map self-prunes when a path's chain goes idle.
+ *
+ * The agent-skill injector keys the same map on its skill DIRECTORY, which can never
+ * collide with a settings-file path, so those writers serialize against each other too.
  */
 const settingsWriteLocks = new Map<string, Promise<unknown>>();
 /**
@@ -582,6 +587,16 @@ export async function writeHooksConfig(casePath: string): Promise<void> {
  * user-owned settings file. It is therefore reserved for case quick-starts,
  * where the user has explicitly asked Codeman to manage that workspace. A
  * malformed existing file is left untouched rather than replaced.
+ *
+ * ⚠️ It has NO production call site: PR #233 landed it with the hook scripts and never
+ * wired it up, and knip can't flag it (`test/**` are entry points, so its tests count as
+ * a use). Kept anyway, because it is redundant with neither sibling: `writeHooksConfig`
+ * REPLACES a malformed settings file and rewrites unconditionally, and
+ * `refreshStaleCodemanHooks` deliberately never adds hooks to a case that has none. The
+ * one place it fits is quick-start's existing-case branch in session-routes.ts, and
+ * moving that branch onto this function is a POLICY change (hooks would come back for a
+ * user who deleted them from their case, and linked cases would start getting a hooks
+ * block they have never had), so that call is left to the owner rather than made here.
  */
 export async function ensureCodemanHooks(casePath: string): Promise<void> {
   const claudeDir = join(casePath, '.claude');
@@ -775,6 +790,29 @@ async function readAgentSkillSource(): Promise<AgentSkillFile[]> {
   return files;
 }
 
+/**
+ * Publish one skill file with a temp + rename, never a bare overwrite.
+ *
+ * Claude Code reads SKILL.md whole when it loads the skill, so an in-place rewrite of
+ * the file (20KB+, several write() syscalls) lets a load that lands mid-write see a
+ * TRUNCATED skill. rename() swaps the finished file in one step, so a
+ * reader sees either the old copy or the new one. The pid+random temp name matters
+ * because `codeman skill install` writes these same paths from a DIFFERENT process than
+ * the server, where the in-process lock cannot help: a shared temp name would let the
+ * two tear each other's payload (same reasoning as user-store.ts).
+ */
+async function writeSkillFileAtomic(target: string, content: string): Promise<void> {
+  // `.tmp` last, so a leftover temp is never picked up as a `.md` skill file.
+  const tmpPath = `${target}.${process.pid}.${randomBytes(6).toString('hex')}.tmp`;
+  try {
+    await writeFile(tmpPath, content);
+    await rename(tmpPath, target);
+  } catch (err) {
+    await unlink(tmpPath).catch(() => {});
+    throw err;
+  }
+}
+
 async function isSymlink(path: string): Promise<boolean> {
   try {
     return (await lstat(path)).isSymbolicLink();
@@ -806,35 +844,43 @@ export type AgentSkillApplyResult =
  *
  * Idempotent and cheap: unchanged files are not rewritten, so calling on every
  * session create causes no mtime churn.
+ *
+ * Serialized on the skill dir through the same lock the settings writers use: two
+ * sessions created at once in one repo both inject this skill, and interleaving their
+ * ownership read with the other's write reports a bogus result (an 'unchanged' for a
+ * copy the other writer had not finished). Writes go out via temp + rename, which is
+ * what protects a concurrent skill LOAD, in this process or the CLI's.
  */
 export async function installAgentSkillInto(skillDir: string): Promise<AgentSkillApplyResult> {
-  if ((await isSymlink(dirname(skillDir))) || (await isSymlink(skillDir))) return 'symlink';
+  return withSettingsLock(skillDir, async () => {
+    if ((await isSymlink(dirname(skillDir))) || (await isSymlink(skillDir))) return 'symlink';
 
-  let existing: string | null = null;
-  try {
-    existing = await readFile(join(skillDir, 'SKILL.md'), 'utf-8');
-  } catch {
-    // absent: fresh install
-  }
-  if (existing !== null && !existing.includes(AGENT_SKILL_MARKER_PREFIX)) return 'foreign';
-
-  const files = await readAgentSkillSource();
-  let changed = false;
-  for (const file of files) {
-    const target = join(skillDir, file.relPath);
-    let current: string | null = null;
+    let existing: string | null = null;
     try {
-      current = await readFile(target, 'utf-8');
+      existing = await readFile(join(skillDir, 'SKILL.md'), 'utf-8');
     } catch {
-      // missing: will be written
+      // absent: fresh install
     }
-    if (current === file.content) continue;
-    await mkdir(dirname(target), { recursive: true });
-    await writeFile(target, file.content);
-    changed = true;
-  }
-  if (!changed) return 'unchanged';
-  return existing === null ? 'installed' : 'refreshed';
+    if (existing !== null && !existing.includes(AGENT_SKILL_MARKER_PREFIX)) return 'foreign';
+
+    const files = await readAgentSkillSource();
+    let changed = false;
+    for (const file of files) {
+      const target = join(skillDir, file.relPath);
+      let current: string | null = null;
+      try {
+        current = await readFile(target, 'utf-8');
+      } catch {
+        // missing: will be written
+      }
+      if (current === file.content) continue;
+      await mkdir(dirname(target), { recursive: true });
+      await writeSkillFileAtomic(target, file.content);
+      changed = true;
+    }
+    if (!changed) return 'unchanged';
+    return existing === null ? 'installed' : 'refreshed';
+  });
 }
 
 /**
@@ -842,28 +888,33 @@ export async function installAgentSkillInto(skillDir: string): Promise<AgentSkil
  * refusals as the install path. Deletes only files the packaged source would have
  * written (never `rm -rf`, so a user's extra files in the directory survive), then
  * prunes the directories bottom-up if they emptied.
+ *
+ * Shares the install path's per-dir lock so an uninstall can't run between an install's
+ * ownership read and its writes, which would leave half the skill back on disk.
  */
 export async function removeAgentSkillFrom(skillDir: string): Promise<AgentSkillApplyResult> {
-  if ((await isSymlink(dirname(skillDir))) || (await isSymlink(skillDir))) return 'symlink';
+  return withSettingsLock(skillDir, async () => {
+    if ((await isSymlink(dirname(skillDir))) || (await isSymlink(skillDir))) return 'symlink';
 
-  let existing: string | null = null;
-  try {
-    existing = await readFile(join(skillDir, 'SKILL.md'), 'utf-8');
-  } catch {
-    return 'absent';
-  }
-  if (!existing.includes(AGENT_SKILL_MARKER_PREFIX)) return 'foreign';
+    let existing: string | null = null;
+    try {
+      existing = await readFile(join(skillDir, 'SKILL.md'), 'utf-8');
+    } catch {
+      return 'absent';
+    }
+    if (!existing.includes(AGENT_SKILL_MARKER_PREFIX)) return 'foreign';
 
-  // Manifest-based, with SKILL.md as the fallback when the packaged source is
-  // unreadable: removal must still work on an install whose skills/ dir went missing.
-  const files = await readAgentSkillSource().catch((): AgentSkillFile[] => [{ relPath: 'SKILL.md', content: '' }]);
-  for (const file of files) {
-    await unlink(join(skillDir, file.relPath)).catch(() => {});
-  }
-  await rmdir(join(skillDir, 'reference')).catch(() => {}); // fails when non-empty, fine
-  await rmdir(skillDir).catch(() => {});
-  await rmdir(dirname(skillDir)).catch(() => {}); // prune `.claude/skills` if now empty
-  return 'removed';
+    // Manifest-based, with SKILL.md as the fallback when the packaged source is
+    // unreadable: removal must still work on an install whose skills/ dir went missing.
+    const files = await readAgentSkillSource().catch((): AgentSkillFile[] => [{ relPath: 'SKILL.md', content: '' }]);
+    for (const file of files) {
+      await unlink(join(skillDir, file.relPath)).catch(() => {});
+    }
+    await rmdir(join(skillDir, 'reference')).catch(() => {}); // fails when non-empty, fine
+    await rmdir(skillDir).catch(() => {});
+    await rmdir(dirname(skillDir)).catch(() => {}); // prune `.claude/skills` if now empty
+    return 'removed';
+  });
 }
 
 /**

src/web/public/app.js

@@ -699,6 +699,10 @@ class CodemanApp {
     // (not at buffer.cursorY, which reflects Ink's internal cursor position)
     this._localEchoOverlay = null;  // created after terminal.open()
     this._localEchoEnabled = false; // true when setting on + session active
+    // Predictive write-through echo (codex) — created after terminal.open()
+    // from the separate vendor/xterm-predictive-echo.js bundle (may stay null)
+    this._predictiveEcho = null;
+    this._localEchoPolicy = 'off';  // 'buffer' | 'predict' | 'off' (per active session)
     this._restoringFlushedState = false; // true during selectSession buffer load — protects flushed Maps
 
     // Accessibility: Focus trap for modals
@@ -3021,6 +3025,9 @@ class CodemanApp {
     // terminal buffer reloads and prompt is visible again.  _render() re-scans
     // for the ❯ prompt on every call, so rerender() after buffer load repositions it.
     this._localEchoOverlay?.rerender();
+    // Deliberate asymmetry: buffer-mode pending text SURVIVES reconnect (not
+    // yet sent); predictions do not (their keystrokes were already delivered).
+    this._predictiveEcho?.clearPredictions();
     // Clear pending hooks
     this.pendingHooks.clear();
     // Clear parent name cache (prevents stale session name entries accumulating)
@@ -4127,6 +4134,9 @@ class CodemanApp {
       }
     }
     this._localEchoOverlay?.clear();
+    // Predictions are ephemeral + already sent: nothing to save/restore
+    // across a tab switch (unlike the buffer overlay's setFlushed machinery)
+    this._predictiveEcho?.clearPredictions();
     // Prevent _detectBufferText() from picking up Claude's Ink UI text
     // (status bar, model info, etc.) as "user input" on fresh sessions.
     // Only sessions with prior flushed text (from tab-switch-away) need detection.

src/web/public/index.html

@@ -38,6 +38,7 @@
   <!-- WebGL addon lazy-loaded by app.js on desktop only (skipped on mobile, saving 244KB) -->
   <script defer src="vendor/xterm-addon-unicode11.min.js"></script>
   <script defer src="vendor/xterm-zerolag-input.js"></script>
+  <script defer src="vendor/xterm-predictive-echo.js"></script>
   <script defer src="vendor/marked.min.js"></script>
   <!-- DOMPurify (allowlist HTML sanitizer for rendered markdown).
        Must load before sanitize-html.js (which wires it) and app.js (which calls it). -->

src/web/public/keyboard-accessory.js

@@ -601,6 +601,9 @@ const KeyboardAccessoryBar = {
    *  must be written raw to be interpreted as key presses by Ink. */
   sendKey(escapeSequence) {
     if (!app.activeSessionId) return;
+    // Arrows/Esc move the server-side cursor and bypass onData: clear
+    // predictions now instead of waiting out the ~150ms off-row grace.
+    app._predictiveEcho?.clearPredictions();
     fetch(`/api/sessions/${app.activeSessionId}/input`, {
       method: 'POST',
       headers: { 'Content-Type': 'application/json' },

src/web/public/sw.js

@@ -40,6 +40,7 @@ const APP_SHELL = [
   '/vendor/xterm-addon-fit.min.js',
   '/vendor/xterm-addon-unicode11.min.js',
   '/vendor/xterm-zerolag-input.js',
+  '/vendor/xterm-predictive-echo.js',
   '/vendor/xterm.css',
   '/icon-192.png',
   '/icon-512.png',

src/web/public/terminal-ui.js

@@ -62,6 +62,42 @@
     return COMPOSER_NAV_KEY_PATTERN.test(data);
   }
 
+  // Codex composer-row signature, measured against codex-cli 0.147.0
+  // (docs/predictive-echo-plan.md): the composer's cursor row starts with
+  // "› " (U+203A + space) when empty (placeholder text), while typing, and
+  // while the slash picker filters. Modal rows ("Press enter to continue")
+  // and wrapped continuation rows (2-space indent) do NOT match — that is
+  // the ghost eliminator: no prediction is ever painted there.
+  const CODEX_COMPOSER_ROW_RE = /^› /;
+
+  // Classify onData for the predictive echo hook. Terminal query responses
+  // never reach this (suppressed earlier in onData); bracketed pastes, nav
+  // keys and mouse reports all start with ESC => 'clear'.
+  function classifyPredictInput(data) {
+    const cps = Array.from(data); // astral-safe
+    if (cps.length === 1) {
+      const cp = cps[0].codePointAt(0);
+      if (cp === 0x7f) return 'backspace';
+      if (cp >= 0x20) return 'char'; // incl. a single astral emoji
+      return 'clear'; // \r \n \t \x03, bare ESC, ...
+    }
+    if (data.charCodeAt(0) === 0x1b) return 'clear'; // ESC seq: nav, paste, mouse SGR
+    if (data.charCodeAt(0) >= 0x20) return 'text'; // multi-char printable (plain paste,
+    return 'clear'; //   ZWJ emoji cluster): wire only, no visual
+  }
+
+  // Predictive-echo gate: predict only while the cursor sits on the codex
+  // composer row. cursorY is baseY-relative (xterm API), hence baseY + cursorY.
+  function isCodexComposerRow(terminal) {
+    try {
+      const buf = terminal.buffer.active;
+      const line = buf.getLine(buf.baseY + buf.cursorY);
+      return !!line && CODEX_COMPOSER_ROW_RE.test(line.translateToString(true));
+    } catch {
+      return false;
+    }
+  }
+
   function isTerminalQueryResponse(data) {
     return TERMINAL_QUERY_RESPONSE_PATTERN.test(data) || TERMINAL_OSC_RESPONSE_PATTERN.test(data);
   }
@@ -99,6 +135,9 @@
     isTerminalQueryResponse,
     shouldSuppressTerminalQueryResponse,
     isComposerNavKey,
+    classifyPredictInput,
+    isCodexComposerRow,
+    CODEX_COMPOSER_ROW_RE,
     BRACKETED_PASTE_START,
     USER_SCROLL_STICKY_SUPPRESS_MS,
     TOUCH_COMPAT_MOUSE_SUPPRESS_MS,
@@ -399,6 +438,12 @@ Object.assign(CodemanApp.prototype, {
     }
 
     this._localEchoOverlay = new LocalEchoOverlay(this.terminal);
+    // Predictive write-through echo (codex): separate opt-in bundle
+    // (vendor/xterm-predictive-echo.js); when it is missing or failed to
+    // load, codex falls back to plain PTY echo exactly like 1.12.2.
+    this._predictiveEcho =
+      typeof PredictiveEchoOverlay !== 'undefined' ? new PredictiveEchoOverlay(this.terminal) : null;
+    this._predictiveEcho?.setPredictWhen((terminal) => window.CodemanTerminalInput.isCodexComposerRow(terminal));
     if (MobileDetection.isTouchDevice()) {
       this.terminal.onCursorMove(() => this._syncMobileHelperTextareaToCursor());
       this.terminal.onRender(() => this._syncMobileHelperTextareaToCursor());
@@ -1108,6 +1153,13 @@ Object.assign(CodemanApp.prototype, {
           }
         }
 
+        // ── Predictive Echo (codex): visual only. A plain statement, never a
+        // `return`: control ALWAYS falls through into the send path below,
+        // which is the byte-identity guarantee for #218/#219/#220/#222 —
+        // with the predictor active, absent or throwing, the wire sees the
+        // same bytes. Body in _predictHookOnData (vm-testable).
+        this._predictHookOnData(data);
+
         // ── Normal Mode (echo disabled) ──
         this._pendingInput += data;
 
@@ -2450,8 +2502,9 @@ Object.assign(CodemanApp.prototype, {
         // grows and rewraps as it fills (#220), pastes are bracketed (#219)
         // and arrows/history edit server-side state (#218). Buffering
         // keystrokes until Enter starves all of that, so codex sessions use
-        // plain PTY echo like shell.
-        // Disable it by clearing any pending text.
+        // plain PTY echo like shell — visually augmented by the predictive
+        // write-through echo (see _localEchoPolicy below and the onData hook).
+        // Disable the buffer overlay by clearing any pending text.
         this._localEchoOverlay.clear();
         this._localEchoEnabled = false;
       } else {
@@ -2484,6 +2537,39 @@ Object.assign(CodemanApp.prototype, {
         });
       }
     }
+
+    // Per-session echo policy: 'buffer' (overlay), 'predict' (codex
+    // write-through, see the onData predict hook), 'off'. _localEchoEnabled
+    // keeps its exact historical values above (false for codex/shell), so
+    // every existing consumer is unchanged; this field is purely additive.
+    let policy = 'off';
+    if (session && echoEnabled) {
+      if (session.mode === 'codex') policy = 'predict';
+      else if (session.mode !== 'shell') policy = 'buffer';
+    }
+    this._localEchoPolicy = policy;
+    if (policy !== 'predict') this._predictiveEcho?.clearPredictions();
+  },
+
+  /**
+   * Predictive-echo onData hook (codex write-through). VISUAL ONLY: paints,
+   * pops or clears prediction spans and never touches _pendingInput, never
+   * sends, never throws into the caller. The onData wire path behaves
+   * byte-identically with this active, absent or broken.
+   */
+  _predictHookOnData(data) {
+    if (this._localEchoPolicy !== 'predict' || !this._predictiveEcho) return;
+    try {
+      const kind = window.CodemanTerminalInput.classifyPredictInput(data);
+      if (kind === 'char') this._predictiveEcho.predictChar(data);
+      else if (kind === 'backspace') this._predictiveEcho.predictBackspace();
+      // 'clear' AND 'text' (plain paste, IME word commits) both change the
+      // composer in ways the display has not shown yet: clear the run and let
+      // the addon's anchor hold suppress prediction until the echo catches up
+      else this._predictiveEcho.clearPredictions();
+    } catch {
+      /* predictions must never block the wire */
+    }
   },
 
   // CJK textarea already provides visual feedback — bypass local echo
@@ -2493,6 +2579,8 @@ Object.assign(CodemanApp.prototype, {
       _crashDiag.log(`CJK send DROP no-session len=${text.length}`);
       return;
     }
+    // Bypasses onData (like insertTerminalText): predictions cannot see this
+    if (this._localEchoPolicy === 'predict') this._predictiveEcho?.clearPredictions();
     _crashDiag.log(`CJK send→${this.activeSessionId.slice(0, 8)} len=${text.length}`);
     this._sendInputAsync(this.activeSessionId, text);
   },
@@ -2848,6 +2936,9 @@ Object.assign(CodemanApp.prototype, {
   /** Insert editable text at the active prompt without pressing Enter. */
   insertTerminalText(text) {
     if (!this.activeSessionId || !text) return;
+    // Under predict the text goes out via sendInput (bypasses onData), so the
+    // hook never sees it: clear outstanding predictions here instead.
+    if (this._localEchoPolicy === 'predict') this._predictiveEcho?.clearPredictions();
     if (
       this._localEchoEnabled &&
       this._localEchoOverlay &&
@@ -2873,6 +2964,8 @@ Object.assign(CodemanApp.prototype, {
       this._inputFlushTimeout = null;
     }
     this._pendingInput = '';
+    // Composer content is about to change out from under any predictions
+    if (this._localEchoPolicy === 'predict') this._predictiveEcho?.clearPredictions();
 
     if (this._localEchoEnabled && this._localEchoOverlay) {
       const flushed = this._localEchoOverlay.getFlushed?.() || { count: 0, text: '' };
@@ -3379,6 +3472,7 @@ Object.assign(CodemanApp.prototype, {
     localStorage.setItem('codeman-font-size', size);
     // Update overlay font cache and re-render at new cell dimensions
     this._localEchoOverlay?.refreshFont();
+    this._predictiveEcho?.refreshFont();
   },
 
   loadFontSize() {
@@ -3513,6 +3607,7 @@ Object.assign(CodemanApp.prototype, {
       // Refresh it on live skin changes so typed text never keeps the prior
       // theme's dark backing surface or foreground color.
       this._localEchoOverlay?.refreshFont();
+      this._predictiveEcho?.refreshFont();
       try {
         this.terminal.refresh(0, this.terminal.rows - 1);
       } catch {}

src/web/public/voice-input.js

@@ -612,6 +612,9 @@ const VoiceInput = {
         if (text) app.sendInput(text).catch(() => {});
         setTimeout(() => app.sendInput('\r').catch(() => {}), 80);
       } else {
+        // Predict-mode sessions (codex) take this branch: the send bypasses
+        // onData, so clear outstanding predictions here (composer will reset)
+        app._predictiveEcho?.clearPredictions();
         app.sendInput('\r').catch(() => {});
       }
       // Blink then restore

src/web/routes/session-routes.ts

@@ -556,6 +556,37 @@ function abortOnClientHangUp(reply: FastifyReply): AbortController {
   return controller;
 }
 
+/**
+ * Inject the agent skill into a case on create, surfacing only the REFUSALS.
+ *
+ * `applyAgentSkill` declines two shapes rather than writing through them ('foreign':
+ * an unmarked skills/codeman the user authored; 'symlink': the skill dir or its
+ * parent is a link). Both were silent: the user flips `agentSkillEnabled` on, nothing
+ * appears in the case, and there is nowhere to look for why. The ordinary outcomes
+ * ('installed'/'refreshed'/'unchanged') stay unlogged since they would print on every
+ * single session create.
+ *
+ * Injection is best-effort and stays that way: neither a refusal nor a thrown error
+ * may fail the create.
+ */
+async function injectAgentSkill(casePath: string): Promise<void> {
+  const skillDir = join(casePath, '.claude', 'skills', 'codeman');
+  try {
+    const result = await applyAgentSkill(casePath, true);
+    if (result === 'foreign') {
+      console.warn(
+        `[agent-skill] not injected: ${skillDir} exists but is not Codeman-managed (no marker), refusing to touch it. Remove that copy if you want the packaged skill there.`
+      );
+    } else if (result === 'symlink') {
+      console.warn(
+        `[agent-skill] not injected: ${skillDir} (or its parent) is a symlink, refusing to write through it. Replace it with a real directory to let Codeman install the skill.`
+      );
+    }
+  } catch (err: unknown) {
+    console.warn(`[agent-skill] injection failed for ${skillDir}: ${getErrorMessage(err)}`);
+  }
+}
+
 export function registerSessionRoutes(
   app: FastifyInstance,
   ctx: SessionPort & EventPort & ConfigPort & InfraPort & AuthPort
@@ -705,7 +736,7 @@ export function registerSessionRoutes(
       // skill from under other live sessions in the repo. Marker-guarded, so a
       // user's own skills/codeman is never touched.
       if (await ctx.getAgentSkillEnabled()) {
-        await applyAgentSkill(workingDir, true).catch(() => {});
+        await injectAgentSkill(workingDir);
       }
     }
 
@@ -2780,7 +2811,7 @@ export function registerSessionRoutes(
     // casePath lives on another host. Docker cases qualify: hostWorkspacePath is a
     // real host dir and the skill crosses the bind mount like the rest of `.claude/`.
     if (!remote && mode === 'claude' && (await ctx.getAgentSkillEnabled())) {
-      await applyAgentSkill(resolvedCasePath, true).catch(() => {});
+      await injectAgentSkill(resolvedCasePath);
     }
 
     // Docker cases: the workspace is a REAL host dir bind-mounted into the container.

test/agent-skill-endpoints-doc.test.ts

@@ -0,0 +1,88 @@
+/**
+ * @fileoverview Static guard: every endpoint the packaged agent skill documents
+ * still exists in the routes it is documenting.
+ *
+ * `skills/codeman/reference/endpoints.md` is injected into cases and read by agents
+ * driving Codeman over HTTP. Nothing tied it to the server, so renaming or dropping a
+ * route left the skill confidently telling agents to call a 404. This parses the
+ * `METHOD /api/...` pairs out of the doc and matches them against the `app.<method>()`
+ * registrations in src/web/routes/*.ts.
+ *
+ * Precision over recall on purpose: only a bare uppercase verb followed by an
+ * `/api/...` path counts, so prose that merely mentions a path (the `.../sessions/null`
+ * jq-pitfall example) is ignored, and a spuriously failing guard does not get deleted
+ * by the next person. `/api/v1` is a URL-rewrite alias (server.ts), so the version
+ * segment is dropped before matching, and param NAMES are normalized away since the
+ * doc's `:id` need not match a route's `:sessionId`.
+ *
+ * Port: N/A (pure static analysis).
+ */
+
+import { describe, it, expect } from 'vitest';
+import { readFileSync, readdirSync } from 'node:fs';
+import { fileURLToPath } from 'node:url';
+import { join } from 'node:path';
+
+const HERE = fileURLToPath(new URL('.', import.meta.url));
+const DOC_PATH = join(HERE, '../skills/codeman/reference/endpoints.md');
+const ROUTES_DIR = join(HERE, '../src/web/routes');
+
+/** `METHOD /api/<path>`, stopping before a query string, backtick or prose. */
+const DOC_ENDPOINT = /\b(GET|POST|PUT|PATCH|DELETE)\s+\/(api\/[A-Za-z0-9_:/-]+)/g;
+/** `app.get('/api/…'`, where the path may sit on its own line (case-routes.ts, file-routes.ts). */
+const ROUTE_REGISTRATION = /app\.(get|post|put|patch|delete)\(\s*'([^']+)'/g;
+
+/**
+ * Strip the `/api/v1` alias and replace param names with a placeholder, so
+ * `GET /api/v1/sessions/:id` and `app.get('/api/sessions/:sessionId')` compare equal.
+ */
+function normalize(method: string, path: string): string {
+  const withoutVersion = path.replace(/^\/api\/v1\//, '/api/');
+  const params = withoutVersion.replace(/\/:[^/]+/g, '/:p').replace(/\/$/, '');
+  return `${method.toUpperCase()} ${params}`;
+}
+
+function documentedEndpoints(): string[] {
+  const markdown = readFileSync(DOC_PATH, 'utf-8');
+  const found = new Set<string>();
+  for (const match of markdown.matchAll(DOC_ENDPOINT)) {
+    found.add(normalize(match[1], `/${match[2]}`));
+  }
+  return [...found].sort();
+}
+
+function registeredRoutes(): Set<string> {
+  const registered = new Set<string>();
+  for (const file of readdirSync(ROUTES_DIR)) {
+    if (!file.endsWith('.ts')) continue;
+    const source = readFileSync(join(ROUTES_DIR, file), 'utf-8');
+    for (const match of source.matchAll(ROUTE_REGISTRATION)) {
+      if (!match[2].startsWith('/api/')) continue;
+      registered.add(normalize(match[1], match[2]));
+    }
+  }
+  return registered;
+}
+
+describe('skills/codeman/reference/endpoints.md', () => {
+  it('parses a plausible number of endpoints out of the doc', () => {
+    // A parser that silently matches nothing would make the real assertion below
+    // pass vacuously forever.
+    const documented = documentedEndpoints();
+    expect(documented.length).toBeGreaterThanOrEqual(10);
+    expect(documented).toContain('POST /api/quick-start');
+    expect(documented).toContain('GET /api/sessions/:p/wait');
+  });
+
+  it('finds the route registrations it matches against', () => {
+    const registered = registeredRoutes();
+    expect(registered.size).toBeGreaterThan(100);
+    expect(registered.has('GET /api/status')).toBe(true);
+  });
+
+  it('documents only endpoints that are actually registered', () => {
+    const registered = registeredRoutes();
+    const missing = documentedEndpoints().filter((endpoint) => !registered.has(endpoint));
+    expect(missing).toEqual([]);
+  });
+});

test/cli-skill-target.test.ts

@@ -0,0 +1,144 @@
+/**
+ * @fileoverview Tests for `codeman skill install|uninstall` target resolution
+ * (`resolveCliCasePath` / `resolveSkillTargetPath` in src/cli.ts).
+ *
+ * The linked-cases lookup shipped in 1.14.2 with no guard: before it, `--case`
+ * rejected every case linked in from outside `~/codeman-cases` with "Case not
+ * found" even though the server resolved the same name fine. These tests pin both
+ * halves of that resolution (registry first, cases dir as fallback) and the
+ * tolerance rules around a missing or malformed registry.
+ *
+ * `test/setup.ts` gives this file its own temporary HOME, so `homedir()` and
+ * `dataPath()` already point into a per-file fixture: no os mocking needed.
+ * Port: N/A (pure path resolution, no server).
+ */
+
+import { describe, it, expect, beforeEach, afterEach } from 'vitest';
+import { mkdirSync, rmSync, writeFileSync, existsSync } from 'node:fs';
+import { homedir } from 'node:os';
+import { join } from 'node:path';
+import { dataPath } from '../src/config/instance.js';
+import { program, resolveCliCasePath, resolveSkillTargetPath } from '../src/cli.js';
+
+const LINKED_CASES_FILE = dataPath('linked-cases.json');
+const CASES_DIR = join(homedir(), 'codeman-cases');
+const LINKED_ROOT = join(homedir(), 'elsewhere');
+
+/** Where the packaged skill lands under a case. Mirrors `applyAgentSkill()`. */
+function skillDirIn(casePath: string): string {
+  return join(casePath, '.claude', 'skills', 'codeman');
+}
+
+function writeLinkedCases(content: string): void {
+  mkdirSync(dataPath(), { recursive: true });
+  writeFileSync(LINKED_CASES_FILE, content, 'utf-8');
+}
+
+beforeEach(() => {
+  rmSync(LINKED_CASES_FILE, { force: true });
+  rmSync(CASES_DIR, { recursive: true, force: true });
+  rmSync(LINKED_ROOT, { recursive: true, force: true });
+});
+
+afterEach(() => {
+  rmSync(LINKED_CASES_FILE, { force: true });
+  rmSync(CASES_DIR, { recursive: true, force: true });
+  rmSync(LINKED_ROOT, { recursive: true, force: true });
+});
+
+describe('resolveSkillTargetPath (global)', () => {
+  it('targets the user-scope skill dir when no --case is given', () => {
+    expect(resolveSkillTargetPath({})).toEqual({
+      target: join(homedir(), '.claude', 'skills', 'codeman'),
+    });
+  });
+
+  it('never consults the linked-cases registry for the global target', () => {
+    // A registry entry named after nothing in particular must not divert the
+    // global install, which is not case-scoped at all.
+    writeLinkedCases(JSON.stringify({ anything: join(LINKED_ROOT, 'anything') }));
+    expect(resolveSkillTargetPath({}).target).toBe(join(homedir(), '.claude', 'skills', 'codeman'));
+  });
+});
+
+describe('resolveCliCasePath / resolveSkillTargetPath (--case)', () => {
+  it('resolves a LINKED case through linked-cases.json, not the cases dir', () => {
+    // The 1.14.2 regression: a case linked in from outside ~/codeman-cases was
+    // resolved to a cases-dir path that does not exist, so install refused it.
+    const linkedPath = join(LINKED_ROOT, 'my-repo');
+    mkdirSync(linkedPath, { recursive: true });
+    writeLinkedCases(JSON.stringify({ 'my-repo': linkedPath }));
+
+    expect(resolveCliCasePath('my-repo')).toBe(linkedPath);
+    expect(resolveSkillTargetPath({ case: 'my-repo' })).toEqual({ target: skillDirIn(linkedPath) });
+    expect(existsSync(join(CASES_DIR, 'my-repo'))).toBe(false);
+  });
+
+  it('falls back to the cases dir for a name the registry does not list', () => {
+    const casePath = join(CASES_DIR, 'plain-case');
+    mkdirSync(casePath, { recursive: true });
+    writeLinkedCases(JSON.stringify({ 'other-case': join(LINKED_ROOT, 'other-case') }));
+
+    expect(resolveCliCasePath('plain-case')).toBe(casePath);
+    expect(resolveSkillTargetPath({ case: 'plain-case' })).toEqual({ target: skillDirIn(casePath) });
+  });
+
+  it('reports the resolved path instead of exiting when the case does not exist', () => {
+    // process.exit(1) lives in the CLI wrapper on purpose: calling it here would
+    // kill the test runner.
+    expect(resolveSkillTargetPath({ case: 'nope' })).toEqual({ missingCase: join(CASES_DIR, 'nope') });
+  });
+
+  it('reports the LINKED path when the registry points at a directory that is gone', () => {
+    const linkedPath = join(LINKED_ROOT, 'moved-away');
+    writeLinkedCases(JSON.stringify({ 'moved-away': linkedPath }));
+
+    expect(resolveSkillTargetPath({ case: 'moved-away' })).toEqual({ missingCase: linkedPath });
+  });
+});
+
+describe('linked-cases.json tolerance', () => {
+  const casePath = () => join(CASES_DIR, 'tolerant');
+
+  beforeEach(() => {
+    mkdirSync(casePath(), { recursive: true });
+  });
+
+  it('degrades to the cases dir when the registry file is absent', () => {
+    expect(existsSync(LINKED_CASES_FILE)).toBe(false);
+    expect(resolveSkillTargetPath({ case: 'tolerant' })).toEqual({ target: skillDirIn(casePath()) });
+  });
+
+  it('degrades to the cases dir on malformed JSON rather than throwing', () => {
+    writeLinkedCases('{ not json at all');
+    expect(() => resolveCliCasePath('tolerant')).not.toThrow();
+    expect(resolveSkillTargetPath({ case: 'tolerant' })).toEqual({ target: skillDirIn(casePath()) });
+  });
+
+  it('degrades to the cases dir when the registry is valid JSON of the wrong shape', () => {
+    // A null / array / non-string-valued entry must read as "no linked case",
+    // never as a target path.
+    for (const body of ['null', '[]', JSON.stringify({ tolerant: 42 }), JSON.stringify({ tolerant: '' })]) {
+      writeLinkedCases(body);
+      expect(resolveCliCasePath('tolerant')).toBe(casePath());
+    }
+  });
+});
+
+describe('skill command wiring', () => {
+  it('registers install and uninstall, both accepting --case and --global', () => {
+    const skill = program.commands.find((cmd) => cmd.name() === 'skill');
+    expect(skill).toBeDefined();
+
+    const subcommands = skill!.commands.map((cmd) => cmd.name());
+    expect(subcommands).toEqual(expect.arrayContaining(['install', 'uninstall']));
+
+    for (const name of ['install', 'uninstall']) {
+      const flags = skill!.commands
+        .find((cmd) => cmd.name() === name)!
+        .options.map((opt) => opt.long)
+        .sort();
+      expect(flags).toEqual(['--case', '--global']);
+    }
+  });
+});

test/codex-predictive-echo.test.ts

@@ -0,0 +1,606 @@
+/**
+ * @fileoverview Predictive-echo E2E against a REAL codex 0.147 TUI (issues
+ * #218/#219/#220/#222 retest scenarios + the byte-identity and simulated-RTT
+ * pins). CI-EXCLUDED (needs chromium + the codex binary); a REQUIRED item of
+ * the release checklist.
+ *
+ * Unlike the other Playwright tests this one cannot use the in-process
+ * WebServer: under VITEST the mux layer is a pure in-memory mock and Session
+ * spawns an echo PTY, so no real codex would ever run. The lab server is a
+ * CHILD PROCESS with the VITEST markers stripped from its env, isolated via
+ * CODEMAN_INSTANCE=codexlab (own data dir under the per-test fixture HOME +
+ * own tmux socket) on port 3222 (3220/3221 are taken; see the port sweep in
+ * the plan). Codex runs against a throwaway CODEX_HOME with a fake API key
+ * (never leaves the box: the first request 401s, which is fine — every
+ * scenario here is about the composer, not completions).
+ *
+ * Run: npx vitest run --config config/vitest.config.ts test/codex-predictive-echo.test.ts
+ */
+import { execSync, spawn, type ChildProcess } from 'node:child_process';
+import { mkdirSync, mkdtempSync, writeFileSync } from 'node:fs';
+import { userInfo } from 'node:os';
+import { resolve } from 'node:path';
+import { afterAll, beforeAll, describe, expect, it } from 'vitest';
+import { chromium, type Browser, type BrowserContext, type Page } from 'playwright';
+
+const PORT = 3222;
+const BASE_URL = `http://localhost:${PORT}`;
+const INSTANCE = 'codexlab';
+const TMUX = `tmux -L codeman-${INSTANCE}`;
+const ROOT = resolve(import.meta.dirname, '..');
+const CODEX_BIN_DIR = `${userInfo().homedir}/.local/bin`;
+
+let server: ChildProcess | null = null;
+let browser: Browser;
+let context: BrowserContext;
+let page: Page;
+let codexHome: string;
+let trustedWorkdir: string;
+let untrustedWorkdir: string;
+let sessionId: string;
+const createdSessions: string[] = [];
+
+function hasCodex(): boolean {
+  try {
+    execSync(`PATH="${CODEX_BIN_DIR}:$PATH" codex --version`, { stdio: 'pipe' });
+    return true;
+  } catch (e) {
+    console.error('[codex-e2e] codex unavailable:', (e as Error).message.slice(0, 300));
+    return false;
+  }
+}
+
+async function api(method: string, path: string, body?: unknown): Promise<any> {
+  const res = await fetch(`${BASE_URL}${path}`, {
+    method,
+    headers: { 'Content-Type': 'application/json' },
+    body: body === undefined ? undefined : JSON.stringify(body),
+  });
+  return res.json();
+}
+
+const paneByTail = new Map<string, string>();
+
+/** Rendered pane text (tmux ground truth). Panes are found once by the
+ *  workdir basename codex prints in its banner, then cached by pane id —
+ *  the lab tmux socket is exclusive to this test. */
+function capturePaneFor(workdir: string): string {
+  const tail = workdir.split('/').pop()!;
+  const panes = execSync(`${TMUX} list-panes -a -F '#{pane_id}'`, { encoding: 'utf8' }).trim().split('\n');
+  const capture = (p: string) => execSync(`${TMUX} capture-pane -p -t '${p}'`, { encoding: 'utf8' });
+  const cached = paneByTail.get(tail);
+  if (cached && panes.includes(cached)) return capture(cached);
+  for (const p of panes.filter(Boolean)) {
+    const text = capture(p);
+    if (text.includes(tail)) {
+      paneByTail.set(tail, p);
+      return text;
+    }
+  }
+  throw new Error(`no pane showing workdir ${tail}; panes: ${panes.join(', ')}`);
+}
+
+async function createCodexSession(workingDir: string): Promise<string> {
+  const created = await api('POST', '/api/sessions', {
+    mode: 'codex',
+    workingDir,
+    envOverrides: { CODEX_HOME: codexHome },
+  });
+  // Tolerate both the ApiResponse envelope and the legacy raw shape
+  const payload = created.data ?? created;
+  const id = payload.session?.id ?? payload.id ?? payload.sessionId;
+  expect(id, JSON.stringify(created).slice(0, 300)).toBeTruthy();
+  createdSessions.push(id);
+  return id;
+}
+
+/** Select the session in the UI and wait for the codex composer to render. */
+async function openInBrowser(id: string): Promise<void> {
+  await page.evaluate((sid) => (window as any).app.selectSession(sid), id);
+  await page.waitForFunction(
+    () => {
+      const app = (window as any).app;
+      const buf = app.terminal?.buffer.active;
+      if (!buf) return false;
+      for (let y = 0; y < app.terminal.rows; y++) {
+        const t = buf.getLine(buf.baseY + y)?.translateToString(true) ?? '';
+        if (/^› /.test(t)) return true;
+      }
+      return false;
+    },
+    undefined,
+    { timeout: 30000 }
+  );
+  await page.locator('#terminalContainer').click({ position: { x: 200, y: 200 } });
+  await page.waitForFunction(() => (window as any).app._localEchoPolicy === 'predict');
+  // Wait for the exact typing precondition: the CURSOR parked on the composer
+  // row (the predictWhen gate itself), not merely a composer row existing —
+  // during the boot animation the cursor roams and predictions are suppressed.
+  await page.waitForFunction(
+    () => {
+      const w = window as any;
+      return w.CodemanTerminalInput.isCodexComposerRow(w.app.terminal);
+    },
+    undefined,
+    { timeout: 20000 }
+  );
+  await new Promise((r) => setTimeout(r, 300));
+}
+
+function predictState(): Promise<{ outstanding: number; confirmedTotal: number; droppedTotal: number }> {
+  return page.evaluate(() => (window as any).app._predictiveEcho.state);
+}
+
+function spanCount(): Promise<number> {
+  return page.evaluate(() => document.querySelectorAll('.xterm-screen [data-predictive-echo] span').length);
+}
+
+/** Deterministic composer reset: codex's Ctrl+U kills only to LINE START, so
+ *  End first; then a settle. Leaves the cursor parked on an empty composer. */
+async function resetComposer(): Promise<void> {
+  // Codex can be mid-respawn after an exhausted 401 retry loop killed it:
+  // wait for a live composer (the gate itself) before touching the keyboard.
+  await page.waitForFunction(
+    () => {
+      const w = window as any;
+      return w.CodemanTerminalInput.isCodexComposerRow(w.app.terminal);
+    },
+    undefined,
+    { timeout: 25000 }
+  );
+  await page.locator('#terminalContainer').click({ position: { x: 200, y: 200 } });
+  await page.keyboard.press('End');
+  await page.keyboard.press('Control+u');
+  await new Promise((r) => setTimeout(r, 400));
+}
+
+/** After a submit 401s, codex sits in a Reconnecting retry loop that can eat
+ *  typed input; Esc interrupts it. Wait until the retry line is gone. */
+async function cancelRetryLoop(): Promise<void> {
+  const deadline = Date.now() + 15000;
+  while (Date.now() < deadline) {
+    const pane = capturePaneFor(trustedWorkdir);
+    if (!/Reconnecting|esc to interrupt/.test(pane)) break;
+    await page.keyboard.press('Escape');
+    await new Promise((r) => setTimeout(r, 500));
+  }
+  // Settle to a live composer (codex may have died at 5/5 and respawned),
+  // then require it to STAY alive: the fake-key request can kill codex
+  // seconds later, so a single gate-true observation is not enough.
+  const stableDeadline = Date.now() + 30000;
+  for (;;) {
+    await resetComposer();
+    let stable = true;
+    for (let i = 0; i < 3; i++) {
+      await new Promise((r) => setTimeout(r, 1000));
+      const alive = await page.evaluate(() => {
+        const w = window as any;
+        return w.CodemanTerminalInput.isCodexComposerRow(w.app.terminal);
+      });
+      if (!alive) {
+        stable = false;
+        break;
+      }
+    }
+    if (stable || Date.now() > stableDeadline) return;
+  }
+}
+
+const CODEX_AVAILABLE = hasCodex();
+const d = CODEX_AVAILABLE ? describe : describe.skip;
+
+beforeAll(async () => {
+  if (!CODEX_AVAILABLE) return;
+  codexHome = mkdtempSync(resolve(ROOT, 'tmp', 'codexlab-'));
+  trustedWorkdir = mkdtempSync(resolve(ROOT, 'tmp', 'codexlab-work-'));
+  untrustedWorkdir = mkdtempSync(resolve(ROOT, 'tmp', 'codexlab-untrusted-'));
+  mkdirSync(codexHome, { recursive: true });
+  writeFileSync(resolve(codexHome, 'auth.json'), JSON.stringify({ OPENAI_API_KEY: 'sk-test-123' }));
+  writeFileSync(resolve(codexHome, 'config.toml'), `[projects."${trustedWorkdir}"]\ntrust_level = "trusted"\n`);
+
+  // Child env: strip the vitest markers so the lab server runs REAL tmux/codex
+  const env: Record<string, string | undefined> = { ...process.env };
+  delete env.VITEST;
+  delete env.VITEST_MODE;
+  delete env.VITEST_POOL_ID;
+  delete env.VITEST_WORKER_ID;
+  delete env.NODE_ENV;
+  env.CODEMAN_INSTANCE = INSTANCE;
+  env.PATH = `${CODEX_BIN_DIR}:${env.PATH}`;
+
+  server = spawn('npx', ['tsx', 'src/index.ts', 'web', '--port', String(PORT)], {
+    cwd: ROOT,
+    env: env as NodeJS.ProcessEnv,
+    stdio: 'ignore',
+    detached: false,
+  });
+
+  // Wait for the lab server
+  const deadline = Date.now() + 30000;
+  for (;;) {
+    try {
+      const res = await fetch(`${BASE_URL}/api/status`);
+      if (res.ok) break;
+    } catch {
+      /* not up yet */
+    }
+    if (Date.now() > deadline) throw new Error('lab server did not start on :3222');
+    await new Promise((r) => setTimeout(r, 300));
+  }
+
+  browser = await chromium.launch({ headless: true });
+  context = await browser.newContext({ viewport: { width: 1280, height: 800 } });
+  page = await context.newPage();
+  await page.addInitScript(() => {
+    localStorage.setItem('codeman-app-settings', JSON.stringify({ localEchoEnabled: true }));
+  });
+  await page.goto(BASE_URL, { waitUntil: 'domcontentloaded' });
+  await page.waitForFunction(() => document.body.classList.contains('app-loaded'), { timeout: 10000 });
+
+  sessionId = await createCodexSession(trustedWorkdir);
+  await openInBrowser(sessionId);
+}, 120_000);
+
+afterAll(async () => {
+  for (const id of createdSessions) {
+    try {
+      await api('DELETE', `/api/sessions/${id}`);
+    } catch {
+      /* best effort */
+    }
+  }
+  await context?.close();
+  await browser?.close();
+  server?.kill('SIGTERM');
+  try {
+    execSync(`${TMUX} kill-server`, { stdio: 'ignore' });
+  } catch {
+    /* already gone */
+  }
+}, 30_000);
+
+d('codex predictive echo E2E (real codex TUI)', () => {
+  it('bundle smoke: both echo globals are defined', async () => {
+    const globals = await page.evaluate(() => ({
+      zerolag: typeof (window as any).LocalEchoOverlay,
+      predictive: typeof (window as any).PredictiveEchoOverlay,
+      instance: !!(window as any).app._predictiveEcho,
+    }));
+    expect(globals.zerolag).toBe('function');
+    expect(globals.predictive).toBe('function');
+    expect(globals.instance).toBe(true);
+  });
+
+  it('typing predicts every char and converges into the real echo', async () => {
+    await page.keyboard.type('hello', { delay: 30 });
+    // Keystrokes went through the predictor (a transient repaint may suppress
+    // one or two: that is designed graceful degradation, never a ghost)
+    await page.waitForFunction(() => {
+      const s = (window as any).app._predictiveEcho.state;
+      return s.confirmedTotal + s.outstanding >= 3;
+    });
+    // Convergence: spans gone, composer shows the text, ZERO mispredictions
+    await page.waitForFunction(
+      () => document.querySelectorAll('.xterm-screen [data-predictive-echo] span').length === 0
+    );
+    const s = await predictState();
+    expect(s.confirmedTotal).toBeGreaterThanOrEqual(3);
+    expect(s.droppedTotal).toBe(0);
+    const deadline = Date.now() + 10000;
+    let pane = '';
+    while (Date.now() < deadline) {
+      pane = capturePaneFor(trustedWorkdir);
+      if (pane.includes('hello')) break;
+      await new Promise((r) => setTimeout(r, 250));
+    }
+    expect(pane).toContain('hello');
+  }, 30_000);
+
+  it('#222: slash picker filters live while predictions confirm away', async () => {
+    await resetComposer();
+    await page.keyboard.type('/', { delay: 30 });
+    const deadline = Date.now() + 10000;
+    let pane = '';
+    while (Date.now() < deadline) {
+      pane = capturePaneFor(trustedWorkdir);
+      if (/\/model|\/skills|\/init/.test(pane)) break;
+      await new Promise((r) => setTimeout(r, 250));
+    }
+    expect(pane).toMatch(/\/model|\/skills|\/init/);
+    await page.keyboard.type('mo', { delay: 40 });
+    await page.waitForFunction(
+      () => document.querySelectorAll('.xterm-screen [data-predictive-echo] span').length === 0
+    );
+    const filtered = capturePaneFor(trustedWorkdir);
+    expect(filtered).toContain('/model');
+    await page.keyboard.press('Escape'); // close the picker
+    await page.keyboard.press('Control+u'); // deterministically empty the composer
+    await new Promise((r) => setTimeout(r, 300));
+    const s = await predictState();
+    expect(s.outstanding).toBe(0);
+  }, 30_000);
+
+  it('#219: typed text + paste land in order with nothing dropped', async () => {
+    await resetComposer();
+    const pidBefore = execSync(`${TMUX} list-panes -a -F '#{pane_id} #{pane_pid}'`, { encoding: 'utf8' }).trim();
+    await page.evaluate(() => {
+      const app = (window as any).app;
+      (window as any).__dbg = [];
+      if (!(window as any).__origSend2) (window as any).__origSend2 = app._sendInputAsync.bind(app);
+      app._sendInputAsync = (sid: string, data: string, opts?: unknown) => {
+        (window as any).__dbg.push([sid.slice(0, 8), JSON.stringify(data)]);
+        return (window as any).__origSend2(sid, data, opts);
+      };
+    });
+    await page.keyboard.type('abc', { delay: 30 });
+    await page.evaluate(() => (window as any).app.terminal.paste('XYZ'));
+    const deadline = Date.now() + 15000;
+    let pane = '';
+    while (Date.now() < deadline) {
+      pane = capturePaneFor(trustedWorkdir);
+      if (pane.includes('abcXYZ')) break;
+      await new Promise((r) => setTimeout(r, 250));
+    }
+    if (!pane.includes('abcXYZ')) {
+      const pidAfter = execSync(`${TMUX} list-panes -a -F '#{pane_id} #{pane_pid}'`, { encoding: 'utf8' }).trim();
+      const dbg = await page.evaluate(() => (window as any).__dbg);
+      const row = await page.evaluate(() => {
+        const b = (window as any).app.terminal.buffer.active;
+        return b.getLine(b.baseY + b.cursorY)?.translateToString(true);
+      });
+      console.log(
+        'DBG219 pids-before:',
+        pidBefore,
+        '| pids-after:',
+        pidAfter,
+        '| sends:',
+        JSON.stringify(dbg),
+        '| app-cursor-row:',
+        JSON.stringify(row)
+      );
+    }
+    expect(pane).toContain('abcXYZ');
+    expect(await spanCount()).toBe(0); // paste classified 'clear'
+    await page.keyboard.press('Control+u'); // Ctrl+U: clear the composer line
+  }, 30_000);
+
+  it('#220: wrapped input renders exactly, no ghost glyphs past the edge', async () => {
+    await resetComposer();
+    const long = 'the quick brown fox jumps over the lazy dog and keeps running until the composer has to wrap';
+    await page.keyboard.type(long, { delay: 5 });
+    // Predictions on the first composer row confirm or drop; continuation
+    // rows are gate-suppressed. Everything converges:
+    await page.waitForFunction(
+      () => document.querySelectorAll('.xterm-screen [data-predictive-echo] span').length === 0,
+      undefined,
+      { timeout: 10000 }
+    );
+    const deadline = Date.now() + 10000;
+    let ok = false;
+    while (Date.now() < deadline) {
+      const pane = capturePaneFor(trustedWorkdir).replace(/\s+/g, ' ');
+      if (pane.includes('composer has to wrap')) {
+        ok = true;
+        break;
+      }
+      await new Promise((r) => setTimeout(r, 250));
+    }
+    expect(ok).toBe(true);
+    await page.keyboard.press('Control+u');
+    await new Promise((r) => setTimeout(r, 200));
+  }, 45_000);
+
+  it('modal ghost eliminator: zero spans while typing on the trust dialog', async () => {
+    const modalSession = await createCodexSession(untrustedWorkdir);
+    try {
+      await page.evaluate((sid) => (window as any).app.selectSession(sid), modalSession);
+      // Wait for the trust dialog (the pane may not exist for the first second)
+      const deadline = Date.now() + 25000;
+      let pane = '';
+      while (Date.now() < deadline) {
+        try {
+          pane = capturePaneFor(untrustedWorkdir);
+          if (pane.includes('Press enter to continue')) break;
+        } catch {
+          /* session still spawning */
+        }
+        await new Promise((r) => setTimeout(r, 300));
+      }
+      expect(pane).toContain('Press enter to continue');
+      await page.waitForFunction(() => (window as any).app._localEchoPolicy === 'predict');
+      await page.locator('#terminalContainer').click({ position: { x: 200, y: 200 } });
+      await page.keyboard.type('x', { delay: 30 });
+      expect(await spanCount()).toBe(0); // gate rejected: no ghost on the modal
+      expect((await predictState()).outstanding).toBe(0);
+    } finally {
+      // Never strand later tests on the modal session
+      await api('DELETE', `/api/sessions/${modalSession}`);
+      await page.evaluate((sid) => (window as any).app.selectSession(sid), sessionId);
+      await page.waitForFunction(() => (window as any).app._localEchoPolicy === 'predict');
+      await page.locator('#terminalContainer').click({ position: { x: 200, y: 200 } });
+    }
+  }, 45_000);
+
+  it('kill switch: localEchoEnabled OFF clears spans and typing still streams', async () => {
+    await page.evaluate(() => {
+      const app = (window as any).app;
+      const s = app.loadAppSettingsFromStorage();
+      s.localEchoEnabled = false;
+      app.saveAppSettingsToStorage(s);
+      app._updateLocalEchoState();
+    });
+    expect(await page.evaluate(() => (window as any).app._localEchoPolicy)).toBe('off');
+    expect(await spanCount()).toBe(0);
+    await page.locator('#terminalContainer').click({ position: { x: 200, y: 200 } });
+    await page.keyboard.press('End');
+    await page.keyboard.press('Control+u');
+    await page.keyboard.type('still-live', { delay: 20 });
+    const deadline = Date.now() + 10000;
+    let pane = '';
+    while (Date.now() < deadline) {
+      pane = capturePaneFor(trustedWorkdir);
+      if (pane.includes('still-live')) break;
+      await new Promise((r) => setTimeout(r, 250));
+    }
+    expect(pane).toContain('still-live'); // 1.12.2 behavior exactly
+    expect(await spanCount()).toBe(0);
+    await page.evaluate(() => {
+      const app = (window as any).app;
+      const s = app.loadAppSettingsFromStorage();
+      s.localEchoEnabled = true;
+      app.saveAppSettingsToStorage(s);
+      app._updateLocalEchoState();
+    });
+    await page.keyboard.press('Control+u');
+    await new Promise((r) => setTimeout(r, 200));
+  }, 30_000);
+
+  it('byte-identity: the wire receives the same bytes with the predictor active vs absent', async () => {
+    const script = async () => {
+      await resetComposer();
+      await page.keyboard.type('ab', { delay: 60 });
+      await page.keyboard.press('Backspace');
+      await page.keyboard.press('ArrowLeft');
+      await page.keyboard.type('c', { delay: 60 });
+      await page.evaluate(() => (window as any).app.terminal.paste('PQ'));
+      await new Promise((r) => setTimeout(r, 250));
+      await page.keyboard.press('End');
+      await page.keyboard.press('Control+u');
+      await new Promise((r) => setTimeout(r, 250));
+    };
+
+    const record = () =>
+      page.evaluate(() => {
+        const app = (window as any).app;
+        (window as any).__trace = [];
+        if (!(window as any).__origSend) (window as any).__origSend = app._sendInputAsync.bind(app);
+        app._sendInputAsync = (sid: string, data: string, opts?: unknown) => {
+          (window as any).__trace.push(data);
+          return (window as any).__origSend(sid, data, opts);
+        };
+      });
+    const trace = () => page.evaluate(() => ((window as any).__trace as string[]).join(''));
+
+    await record();
+    await script();
+    const withPredictor = await trace();
+
+    await page.evaluate(() => {
+      (window as any).__savedPredictor = (window as any).app._predictiveEcho;
+      (window as any).app._predictiveEcho = null;
+    });
+    await record();
+    await script();
+    const withoutPredictor = await trace();
+    await page.evaluate(() => {
+      (window as any).app._predictiveEcho = (window as any).__savedPredictor;
+    });
+
+    expect(withPredictor.length).toBeGreaterThan(0);
+    expect(withoutPredictor).toBe(withPredictor); // the visual-only invariant, end to end
+  }, 60_000);
+
+  it('#218: arrows + mid-word insert submit the exact edited text', async () => {
+    await resetComposer();
+    await page.keyboard.type('hello', { delay: 30 });
+    await new Promise((r) => setTimeout(r, 300));
+    await page.keyboard.press('ArrowLeft');
+    // Nav keys clear predictions immediately (classify 'clear')
+    expect(await predictState()).toMatchObject({ outstanding: 0 });
+    expect(await spanCount()).toBe(0);
+    await page.keyboard.press('ArrowLeft');
+    await page.keyboard.type('X', { delay: 30 });
+    await page.keyboard.press('Enter');
+    // The submitted transcript line carries the edited text
+    const deadline = Date.now() + 15000;
+    let pane = '';
+    while (Date.now() < deadline) {
+      pane = capturePaneFor(trustedWorkdir);
+      if (pane.includes('helXlo')) break;
+      await new Promise((r) => setTimeout(r, 300));
+    }
+    expect(pane).toContain('helXlo');
+    expect(await spanCount()).toBe(0);
+    await cancelRetryLoop();
+  }, 45_000);
+
+  it('simulated 300ms RTT: instant spans with correct pixel geometry, exact convergence', async () => {
+    await resetComposer();
+    // Delay every terminal.write chunk by 300ms: display-side injection only,
+    // the wire is untouched. This is the condition the feature exists for.
+    await page.evaluate(() => {
+      const app = (window as any).app;
+      (window as any).__origWrite = app.terminal.write.bind(app.terminal);
+      app.terminal.write = (data: unknown, cb?: () => void) =>
+        setTimeout(() => (window as any).__origWrite(data, cb), 300);
+    });
+    // Let any pre-wrapper chunks and their reconcile passes settle first
+    await new Promise((r) => setTimeout(r, 700));
+    const base = await predictState();
+
+    await page.keyboard.press('h');
+    // The span exists NOW, long before the delayed echo can land
+    const snap = await page.evaluate(() => {
+      const app = (window as any).app;
+      const span = document.querySelector('.xterm-screen [data-predictive-echo] span') as HTMLElement;
+      const screen = document.querySelector('.xterm-screen') as HTMLElement;
+      const dims = app.terminal._core._renderService.dimensions.css.cell;
+      const buf = app.terminal.buffer.active;
+      return span
+        ? {
+            outstanding: app._predictiveEcho.state.outstanding,
+            spanLeft: span.getBoundingClientRect().left - screen.getBoundingClientRect().left,
+            spanTop: span.getBoundingClientRect().top - screen.getBoundingClientRect().top,
+            expectedLeft: buf.cursorX * dims.width,
+            expectedTop: buf.cursorY * dims.height,
+            text: span.textContent,
+          }
+        : null;
+    });
+    expect(snap).not.toBeNull();
+    expect(snap!.outstanding).toBe(1);
+    expect(snap!.text).toBe('h');
+    // Pixel geometry: the DOM span sits on the exact cell the echo will use
+    expect(Math.abs(snap!.spanLeft - snap!.expectedLeft)).toBeLessThan(1.5);
+    expect(Math.abs(snap!.spanTop - snap!.expectedTop)).toBeLessThan(1.5);
+
+    await page.keyboard.type('igh rtt', { delay: 40 });
+    // (No mid-flight outstanding assertion: with local codex the delayed echo
+    // begins confirming DURING the typing. The snap above already pinned the
+    // zero-lag property; convergence + the delta below pin the rest.)
+
+    // Full convergence after the delayed echo lands
+    await page.waitForFunction(
+      () => document.querySelectorAll('.xterm-screen [data-predictive-echo] span').length === 0,
+      undefined,
+      { timeout: 15000 }
+    );
+    const deadline = Date.now() + 10000;
+    let pane = '';
+    while (Date.now() < deadline) {
+      pane = capturePaneFor(trustedWorkdir);
+      if (pane.includes('high rtt')) break;
+      await new Promise((r) => setTimeout(r, 250));
+    }
+    expect(pane).toContain('high rtt');
+    const after = await predictState();
+    expect(after.confirmedTotal - base.confirmedTotal).toBeGreaterThanOrEqual(6); // h + igh rtt
+
+    // #218 under RTT: arrows still edit correctly with the delayed display
+    await page.keyboard.press('ArrowLeft');
+    await page.keyboard.type('Z', { delay: 40 });
+    await page.keyboard.press('Enter');
+    const deadline2 = Date.now() + 15000;
+    let pane2 = '';
+    while (Date.now() < deadline2) {
+      pane2 = capturePaneFor(trustedWorkdir);
+      if (pane2.includes('high rtZt')) break;
+      await new Promise((r) => setTimeout(r, 300));
+    }
+    expect(pane2).toContain('high rtZt');
+
+    await page.evaluate(() => {
+      (window as any).app.terminal.write = (window as any).__origWrite;
+    });
+  }, 90_000);
+});

test/local-echo-codex-gating.test.ts

@@ -238,3 +238,232 @@ describe('insertTerminalText pass-through routing', () => {
     expect(overlay.appendText).not.toHaveBeenCalled();
   });
 });
+
+// ─── Predictive write-through echo (codex) ──────────────────────────────────
+
+type PredictorStub = {
+  predictChar: ReturnType<typeof vi.fn>;
+  predictBackspace: ReturnType<typeof vi.fn>;
+  clearPredictions: ReturnType<typeof vi.fn>;
+};
+
+type PredictiveApp = AppInstance & {
+  _localEchoPolicy?: string;
+  _predictiveEcho?: PredictorStub | null;
+  _predictHookOnData(data: string): void;
+};
+
+function makePredictor(): PredictorStub {
+  return {
+    predictChar: vi.fn().mockReturnValue(true),
+    predictBackspace: vi.fn().mockReturnValue(true),
+    clearPredictions: vi.fn(),
+  };
+}
+
+const classifyPredictInput = terminalInput.classifyPredictInput as (data: string) => string;
+const isCodexComposerRow = terminalInput.isCodexComposerRow as (t: unknown) => boolean;
+
+describe('CodemanTerminalInput.classifyPredictInput', () => {
+  it.each([
+    ['a', 'char'],
+    [' ', 'char'],
+    ['€', 'char'],
+    ['你', 'char'],
+    ['😀', 'char'], // single astral codepoint
+    ['\x7f', 'backspace'],
+    ['\r', 'clear'],
+    ['\n', 'clear'],
+    ['\t', 'clear'],
+    ['\x03', 'clear'], // Ctrl+C
+    ['\x15', 'clear'], // Ctrl+U
+    ['\x1b', 'clear'], // bare ESC
+    ['\x1b[A', 'clear'], // arrow
+    ['\x1bOA', 'clear'], // SS3 arrow
+    ['\x1b[3~', 'clear'], // Delete
+    ['\x1b[200~hi\x1b[201~', 'clear'], // bracketed paste
+    ['\x1b[<0;10;5M', 'clear'], // mouse SGR report
+    ['abc', 'text'], // plain multi-char paste
+    ['👨‍👩‍👧', 'text'], // ZWJ emoji cluster
+    ['\r\n', 'clear'],
+  ])('classifies %j as %s', (data, expected) => {
+    expect(classifyPredictInput(data)).toBe(expected);
+  });
+});
+
+describe('CodemanTerminalInput.isCodexComposerRow', () => {
+  function terminalWithCursorRow(text: string | null) {
+    return {
+      buffer: {
+        active: {
+          baseY: 4,
+          cursorY: 2,
+          getLine: (y: number) => (y === 6 && text !== null ? { translateToString: () => text } : undefined),
+        },
+      },
+    };
+  }
+
+  it.each([
+    '› ', // empty composer
+    '› Use /skills to list available skills', // placeholder
+    '› hello', // typed text
+    '› /mo', // slash picker filtering
+  ])('matches the composer row %j', (row) => {
+    expect(isCodexComposerRow(terminalWithCursorRow(row))).toBe(true);
+  });
+
+  it.each([
+    '  Press enter to continue', // trust/approval modal
+    '  this line twice over', // wrapped continuation row (2-space indent)
+    '›no-space',
+    '1. Yes, continue',
+    '',
+  ])('rejects the non-composer row %j', (row) => {
+    expect(isCodexComposerRow(terminalWithCursorRow(row))).toBe(false);
+  });
+
+  it('reads the cursor row baseY-relative (baseY + cursorY)', () => {
+    // terminalWithCursorRow only answers getLine(6) = baseY 4 + cursorY 2;
+    // a viewportY-based read would ask for a different line and get undefined
+    expect(isCodexComposerRow(terminalWithCursorRow('› x'))).toBe(true);
+  });
+
+  it('returns false when the row is missing or getLine throws', () => {
+    expect(isCodexComposerRow(terminalWithCursorRow(null))).toBe(false);
+    const hostile = {
+      buffer: {
+        active: {
+          baseY: 0,
+          cursorY: 0,
+          getLine: () => {
+            throw new Error('boom');
+          },
+        },
+      },
+    };
+    expect(isCodexComposerRow(hostile)).toBe(false);
+  });
+});
+
+describe('_updateLocalEchoState echo policy', () => {
+  it("codex + setting ON -> policy 'predict' while _localEchoEnabled stays false", () => {
+    const app = makeApp('codex') as PredictiveApp;
+    app._predictiveEcho = makePredictor();
+    app._updateLocalEchoState();
+    expect(app._localEchoPolicy).toBe('predict');
+    expect(app._localEchoEnabled).toBe(false); // 1.12.2 invariant untouched
+    expect(app._predictiveEcho.clearPredictions).not.toHaveBeenCalled();
+  });
+
+  it("codex + setting OFF -> policy 'off' and predictions cleared (kill switch)", () => {
+    const app = makeApp('codex') as PredictiveApp;
+    app._predictiveEcho = makePredictor();
+    app.loadAppSettingsFromStorage = () => ({ localEchoEnabled: false });
+    app._updateLocalEchoState();
+    expect(app._localEchoPolicy).toBe('off');
+    expect(app._predictiveEcho.clearPredictions).toHaveBeenCalled();
+  });
+
+  it("shell -> policy 'off'", () => {
+    const app = makeApp('shell') as PredictiveApp;
+    app._predictiveEcho = makePredictor();
+    app._updateLocalEchoState();
+    expect(app._localEchoPolicy).toBe('off');
+    expect(app._predictiveEcho.clearPredictions).toHaveBeenCalled();
+  });
+
+  it.each(['claude', 'gemini', 'opencode'])("%s -> policy 'buffer' + overlay enabled (existing behavior)", (mode) => {
+    const overlay = makeOverlay();
+    const app = makeApp(mode, overlay) as PredictiveApp;
+    app._predictiveEcho = makePredictor();
+    app._updateLocalEchoState();
+    expect(app._localEchoPolicy).toBe('buffer');
+    expect(app._localEchoEnabled).toBe(true);
+    expect(overlay.prompts.length).toBeGreaterThan(0); // setPrompt still called
+    expect(app._predictiveEcho.clearPredictions).toHaveBeenCalled(); // not predict -> stray spans cleared
+  });
+
+  it('no active session -> policy off, no crash without a predictor instance', () => {
+    const app = makeApp('codex') as PredictiveApp;
+    app._predictiveEcho = null;
+    app.activeSessionId = null;
+    expect(() => app._updateLocalEchoState()).not.toThrow();
+    expect(app._localEchoPolicy).toBe('off');
+  });
+});
+
+describe('_predictHookOnData (wire neutrality)', () => {
+  function makePredictApp(): PredictiveApp {
+    const app = makeApp('codex') as PredictiveApp;
+    app._predictiveEcho = makePredictor();
+    app._updateLocalEchoState(); // -> 'predict'
+    return app;
+  }
+
+  it('routes char/backspace/clear kinds to the predictor', () => {
+    const app = makePredictApp();
+    app._predictHookOnData('h');
+    expect(app._predictiveEcho!.predictChar).toHaveBeenCalledWith('h');
+    app._predictHookOnData('\x7f');
+    expect(app._predictiveEcho!.predictBackspace).toHaveBeenCalled();
+    app._predictHookOnData('\r');
+    expect(app._predictiveEcho!.clearPredictions).toHaveBeenCalled();
+  });
+
+  it("kind 'text' (plain paste, IME commit) clears the run like 'clear'", () => {
+    // Review finding: an IME word-commit changes the composer without a
+    // prediction; new predictions after it would mis-anchor until cascade.
+    const app = makePredictApp();
+    app._predictHookOnData('pasted text');
+    expect(app._predictiveEcho!.predictChar).not.toHaveBeenCalled();
+    expect(app._predictiveEcho!.clearPredictions).toHaveBeenCalled();
+  });
+
+  it('never touches _pendingInput and never sends (visual-only pin)', () => {
+    const app = makePredictApp();
+    app._pendingInput = 'queued';
+    for (const data of ['h', 'i', '\x7f', '\r', '\x1b[A', 'multi char', '\x1b[200~x\x1b[201~']) {
+      app._predictHookOnData(data);
+    }
+    expect(app._pendingInput).toBe('queued');
+    expect(app.sendInput).not.toHaveBeenCalled();
+  });
+
+  it('is inert under buffer/off policies and without a predictor', () => {
+    const buffered = makeApp('claude') as PredictiveApp;
+    buffered._predictiveEcho = makePredictor();
+    buffered._updateLocalEchoState(); // 'buffer'
+    buffered._predictHookOnData('h');
+    expect(buffered._predictiveEcho.predictChar).not.toHaveBeenCalled();
+
+    const bundleless = makeApp('codex') as PredictiveApp;
+    bundleless._predictiveEcho = null;
+    bundleless._updateLocalEchoState();
+    expect(() => bundleless._predictHookOnData('h')).not.toThrow();
+  });
+
+  it('a throwing predictor cannot break the hook (exception pin)', () => {
+    const app = makePredictApp();
+    app._predictiveEcho!.predictChar.mockImplementation(() => {
+      throw new Error('boom');
+    });
+    app._pendingInput = 'queued';
+    expect(() => app._predictHookOnData('h')).not.toThrow();
+    expect(app._pendingInput).toBe('queued');
+    expect(app.sendInput).not.toHaveBeenCalled();
+  });
+});
+
+describe('insertTerminalText under predict policy', () => {
+  it('routes to sendInput (not the overlay) and clears predictions', () => {
+    const overlay = makeOverlay();
+    const app = makeApp('codex', overlay) as PredictiveApp;
+    app._predictiveEcho = makePredictor();
+    app._updateLocalEchoState(); // predict; _localEchoEnabled false
+    app.insertTerminalText('path.txt');
+    expect(app.sendInput).toHaveBeenCalledWith('path.txt');
+    expect(overlay.appendText).not.toHaveBeenCalled();
+    expect(app._predictiveEcho.clearPredictions).toHaveBeenCalled();
+  });
+});

test/mobile/README.md

@@ -16,22 +16,30 @@ Validates Codeman's mobile UI across 136 devices, covering:
 
 ## Quick Start
 
+⚠️ Go through `npm run test:mobile`, not `npx vitest` directly. The suite serves the
+page from `src/web/public`, but `npm run build` puts the xterm vendor bundles in
+`dist/web/public`, so without them every `/vendor/xterm*` request 404s, `Terminal` is
+never defined and every test touching `app.terminal` fails on a null. The
+`pretest:mobile` hook (`scripts/prepare-test-vendor.mjs`) is what puts them in place,
+and npm only fires it for `npm run test:mobile`. Run the prepare script by hand first
+if you really need a bare `npx vitest`.
+
 ```bash
 # Run all mobile tests
-npx vitest run --config test/mobile/vitest.config.ts
+npm run test:mobile
 
 # Run a single test file
-npx vitest run --config test/mobile/vitest.config.ts test/mobile/keyboard.test.ts
+npm run test:mobile -- test/mobile/keyboard.test.ts
 
-# Quick mode — 6 representative devices, skip full matrix
-CI_QUICK=1 npx vitest run --config test/mobile/vitest.config.ts
+# Quick mode: 6 representative devices, skip full matrix
+CI_QUICK=1 npm run test:mobile
 
 # Full device matrix only (136 devices)
-npx vitest run --config test/mobile/vitest.config.ts test/mobile/device-matrix.test.ts
+npm run test:mobile -- test/mobile/device-matrix.test.ts
 
 # Update visual baselines (delete old baselines, re-run)
 rm -rf test/mobile/snapshots/*.png
-npx vitest run --config test/mobile/vitest.config.ts test/mobile/visual-regression.test.ts
+npm run test:mobile -- test/mobile/visual-regression.test.ts
 ```
 
 ## Test Files

test/mobile/keyboard.test.ts

@@ -841,7 +841,7 @@ describe('Virtual Keyboard', () => {
         app.activeSessionId = 'mobile-visible-input-test';
         app.sessions.set('mobile-visible-input-test', {
           id: 'mobile-visible-input-test',
-          mode: 'codex',
+          mode: 'claude',
           status: 'running',
         });
         app.hideWelcome();
@@ -887,7 +887,7 @@ describe('Virtual Keyboard', () => {
         app.activeSessionId = 'mobile-cursor-fallback-test';
         app.sessions.set('mobile-cursor-fallback-test', {
           id: 'mobile-cursor-fallback-test',
-          mode: 'codex',
+          mode: 'claude',
           status: 'running',
         });
         app.hideWelcome();
@@ -915,6 +915,58 @@ describe('Virtual Keyboard', () => {
       expect(state.overlayState?.visible).toBe(true);
       expect(state.overlayState?.promptPosition).not.toBeNull();
     });
+
+    it('codex: streams keystrokes write-through and paints predictions (no buffering)', async () => {
+      await page.evaluate(async () => {
+        window.__sentInputs = [];
+        app.activeSessionId = 'mobile-codex-predict-test';
+        app.sessions.set('mobile-codex-predict-test', {
+          id: 'mobile-codex-predict-test',
+          mode: 'codex',
+          status: 'running',
+        });
+        app.hideWelcome();
+        app._sendInputAsync = (_sessionId: string, input: string) => {
+          window.__sentInputs.push(input);
+        };
+        const settings = app.loadAppSettingsFromStorage();
+        settings.cjkInputEnabled = false;
+        settings.localEchoEnabled = true;
+        app.saveAppSettingsToStorage(settings);
+        app._updateCjkInputState();
+        app._updateLocalEchoState();
+        // Paint a codex-like composer row so the predictWhen gate passes
+        app.terminal.reset();
+        await new Promise<void>((resolve) => app.terminal.write('\u203a ', resolve));
+        app.terminal.focus();
+      });
+
+      await page.locator('#terminalContainer').tap({ position: { x: 40, y: 40 } });
+      await page.keyboard.type('hey');
+
+      // Write-through: the keystrokes reach the send path BEFORE any Enter,
+      // and the buffer overlay holds nothing
+      await page.waitForFunction(() => window.__sentInputs?.join('') === 'hey');
+      const typed = await page.evaluate(() => ({
+        policy: app._localEchoPolicy,
+        pendingText: app._localEchoOverlay?.pendingText ?? '',
+        outstanding: app._predictiveEcho?.state.outstanding ?? -1,
+        spans: document.querySelectorAll('.xterm-screen [data-predictive-echo] span').length,
+      }));
+      expect(typed.policy).toBe('predict');
+      expect(typed.pendingText).toBe('');
+      expect(typed.outstanding).toBeGreaterThan(0);
+      expect(typed.spans).toBe(typed.outstanding);
+
+      // No echo ever arrives (stubbed session): TTL self-heals within ~1s
+      await page.waitForFunction(
+        () => document.querySelectorAll('.xterm-screen [data-predictive-echo] span').length === 0,
+        undefined,
+        { timeout: 4000 }
+      );
+      const settled = await page.evaluate(() => app._predictiveEcho?.state.outstanding);
+      expect(settled).toBe(0);
+    });
   });
 
   // ── Cross-device keyboard behavior ────────────────────────────────────

test/mocks/mock-route-context.ts

@@ -15,7 +15,7 @@ import { resolveTerminalHistoryConfig } from '../../src/config/terminal-history.
  * Creates a mock context that satisfies all port interfaces.
  * Pre-populated with one session for convenience.
  */
-export function createMockRouteContext(options?: { sessionId?: string }) {
+export function createMockRouteContext(options?: { sessionId?: string; agentSkillEnabled?: boolean }) {
   const sessionId = options?.sessionId ?? 'test-session-1';
   const session = createMockSession(sessionId);
   const sessions = new Map<string, MockSession>();
@@ -86,7 +86,10 @@ export function createMockRouteContext(options?: { sessionId?: string }) {
     getModelConfig: vi.fn(async () => null),
     getClaudeModeConfig: vi.fn(async () => ({})),
     getTerminalHistoryConfig: vi.fn(async () => resolveTerminalHistoryConfig({})),
-    getAgentSkillEnabled: vi.fn(async () => false),
+    // Default OFF mirrors the shipped setting, so existing tests never touch a
+    // case's .claude/skills. Overridable per test because the create-time
+    // injection call sites are otherwise unreachable from a route test.
+    getAgentSkillEnabled: vi.fn(async () => options?.agentSkillEnabled ?? false),
     getDefaultClaudeMdPath: vi.fn(async () => undefined),
     getLightState: vi.fn(() => ({ sessions: [], status: 'ok' })),
     getLightSessionsState: vi.fn(() => {

test/routes/session-routes-agent-skill.test.ts

@@ -0,0 +1,121 @@
+/**
+ * @fileoverview Agent-skill injection on POST /api/sessions (docs/agent-control-plan.md §2).
+ *
+ * The quick-start half of this is covered end-to-end in test/quick-start.test.ts;
+ * the plain create path had NO coverage, because the shared mock context hardcoded
+ * `getAgentSkillEnabled` to false and nothing could flip it. This exercises the real
+ * `applyAgentSkill` against a temp working dir, so it asserts bytes on disk rather
+ * than a spy call.
+ *
+ * Uses app.inject(), so no real HTTP port is needed.
+ */
+
+import { describe, it, expect, beforeEach, afterEach } from 'vitest';
+import Fastify, { type FastifyInstance } from 'fastify';
+import fastifyCookie from '@fastify/cookie';
+import { mkdtemp, rm, readFile } from 'node:fs/promises';
+import { existsSync } from 'node:fs';
+import { join } from 'node:path';
+import { tmpdir } from 'node:os';
+import { createMockRouteContext, type MockRouteContext } from '../mocks/index.js';
+import { installRouteErrorHandler } from '../../src/web/route-error-handler.js';
+import { registerSessionRoutes } from '../../src/web/routes/session-routes.js';
+
+const MARKER_PREFIX = '<!-- codeman-managed-agent-skill';
+
+interface Harness {
+  app: FastifyInstance;
+  ctx: MockRouteContext;
+}
+
+async function createHarness(agentSkillEnabled: boolean): Promise<Harness> {
+  const app = Fastify({ logger: false });
+  await app.register(fastifyCookie);
+  const ctx = createMockRouteContext({ agentSkillEnabled });
+  registerSessionRoutes(app, ctx);
+  installRouteErrorHandler(app);
+  await app.ready();
+  return { app, ctx };
+}
+
+describe('POST /api/sessions agent-skill injection', () => {
+  let workingDir: string;
+  let harness: Harness | undefined;
+
+  const skillDir = () => join(workingDir, '.claude', 'skills', 'codeman');
+
+  beforeEach(async () => {
+    workingDir = await mkdtemp(join(tmpdir(), 'codeman-create-skill-'));
+  });
+
+  afterEach(async () => {
+    await harness?.app.close();
+    harness = undefined;
+    await rm(workingDir, { recursive: true, force: true });
+  });
+
+  it('injects the packaged skill into the working dir when the gate is ON', async () => {
+    harness = await createHarness(true);
+
+    const res = await harness.app.inject({
+      method: 'POST',
+      url: '/api/sessions',
+      payload: { name: 'skill-on', mode: 'claude', workingDir },
+    });
+
+    expect(res.statusCode).toBe(200);
+    expect(harness.ctx.getAgentSkillEnabled).toHaveBeenCalled();
+
+    const skillMd = await readFile(join(skillDir(), 'SKILL.md'), 'utf-8');
+    expect(skillMd.startsWith('---\nname: codeman')).toBe(true);
+    // The marker is what makes the copy ours: without it, uninstall refuses to
+    // remove what this create wrote.
+    expect(skillMd).toContain(MARKER_PREFIX);
+    expect(existsSync(join(skillDir(), 'reference', 'endpoints.md'))).toBe(true);
+  });
+
+  it('leaves the working dir untouched when the gate is OFF', async () => {
+    harness = await createHarness(false);
+
+    const res = await harness.app.inject({
+      method: 'POST',
+      url: '/api/sessions',
+      payload: { name: 'skill-off', mode: 'claude', workingDir },
+    });
+
+    expect(res.statusCode).toBe(200);
+    expect(harness.ctx.getAgentSkillEnabled).toHaveBeenCalled();
+    expect(existsSync(skillDir())).toBe(false);
+  });
+
+  it('does not inject for a non-claude mode even when the gate is ON', async () => {
+    // `.claude/skills/` is read by Claude Code only, so the gate is never even
+    // consulted for the other backends.
+    harness = await createHarness(true);
+
+    const res = await harness.app.inject({
+      method: 'POST',
+      url: '/api/sessions',
+      payload: { name: 'skill-shell', mode: 'shell', workingDir },
+    });
+
+    expect(res.statusCode).toBe(200);
+    expect(harness.ctx.getAgentSkillEnabled).not.toHaveBeenCalled();
+    expect(existsSync(skillDir())).toBe(false);
+  });
+
+  it('defaults an omitted mode to claude and injects', async () => {
+    // The frontend omits `mode` for a plain claude create, so the default branch
+    // is the common path, not an edge case.
+    harness = await createHarness(true);
+
+    const res = await harness.app.inject({
+      method: 'POST',
+      url: '/api/sessions',
+      payload: { name: 'skill-default-mode', workingDir },
+    });
+
+    expect(res.statusCode).toBe(200);
+    expect(existsSync(join(skillDir(), 'SKILL.md'))).toBe(true);
+  });
+});