Merge pull request #240 from Ark0N/feat/predictive-echo-codex

Zero-lag predictive echo for Codex sessions (mosh-style write-through)

.changeset/c4baa514.md

@@ -0,0 +1,15 @@
+---
+"aicodeman": minor
+"xterm-zerolag-input": minor
+---
+
+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.

.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.

CLAUDE.md

@@ -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)
 

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/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

@@ -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",
@@ -12336,6 +12346,7 @@
       "version": "0.1.8",
       "license": "MIT",
       "devDependencies": {
+        "@xterm/headless": "^6.0.0",
         "jsdom": "^24.1.3",
         "tsup": "^8.5.1",
         "typescript": "^5.5.0",

packages/xterm-zerolag-input/CHANGELOG.md

@@ -1,5 +1,17 @@
 # xterm-zerolag-input
 
+## 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": "0.2.0",
   "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
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
-    const t = terminal as any;
+  const t = terminal as any;
-    const dpr = typeof devicePixelRatio === 'number' && devicePixelRatio > 0
+  const dpr = typeof devicePixelRatio === 'number' && devicePixelRatio > 0 ? devicePixelRatio : 1;
-        ? devicePixelRatio : 1;
 
-    // Try v7+ public API first
+  // Try v7+ public API first
-    if (t.dimensions?.css?.cell) {
+  if (t.dimensions?.css?.cell) {
-        const cellH = t.dimensions.css.cell.height;
+    const cellH = t.dimensions.css.cell.height;
-        return {
+    return {
-            width: t.dimensions.css.cell.width,
+      width: t.dimensions.css.cell.width,
-            height: cellH,
+      height: cellH,
-            charTop: (t.dimensions?.device?.char?.top ?? 0) / dpr,
+      charTop: (t.dimensions?.device?.char?.top ?? 0) / dpr,
-            charHeight: (t.dimensions?.device?.char?.height ?? (cellH * dpr)) / 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
+  return null;
-    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;
 }

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,
+  XtermTerminal,
-    XtermAddon,
+  XtermAddon,
-    ZerolagInputOptions,
+  ZerolagInputOptions,
-    ZerolagInputState,
+  ZerolagInputState,
-    PromptFinder,
+  PromptFinder,
-    PromptPosition,
+  PromptPosition,
-    CellDimensions,
+  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(
+export function findPrompt(terminal: XtermTerminal, finder: PromptFinder): PromptPosition | null {
-    terminal: XtermTerminal,
+  try {
-    finder: PromptFinder,
+    const buffer = terminal.buffer.active;
-): PromptPosition | null {
+    const viewportTop = buffer.viewportY;
-    try {
-        const buffer = terminal.buffer.active;
-        const viewportTop = buffer.viewportY;
 
-        switch (finder.type) {
+    switch (finder.type) {
-            case 'character': {
+      case 'character': {
-                for (let row = terminal.rows - 1; row >= 0; row--) {
+        for (let row = terminal.rows - 1; row >= 0; row--) {
-                    const line = buffer.getLine(viewportTop + row);
+          const line = buffer.getLine(viewportTop + row);
-                    if (!line) continue;
+          if (!line) continue;
-                    const text = line.translateToString(true);
+          const text = line.translateToString(true);
-                    const idx = text.lastIndexOf(finder.char);
+          const idx = text.lastIndexOf(finder.char);
-                    if (idx >= 0) return { row, col: idx };
+          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;
         }
-    } 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(
+export function readTextAfterPrompt(terminal: XtermTerminal, prompt: PromptPosition, offset: number): string {
-    terminal: XtermTerminal,
+  try {
-    prompt: PromptPosition,
+    const buffer = terminal.buffer.active;
-    offset: number,
+    const absRow = buffer.viewportY + prompt.row;
-): string {
+    const line = buffer.getLine(absRow);
-    try {
+    if (!line) return '';
-        const buffer = terminal.buffer.active;
+    const lineText = line.translateToString(true);
-        const absRow = buffer.viewportY + prompt.row;
+    return lineText.slice(prompt.col + offset).trimEnd();
-        const line = buffer.getLine(absRow);
+  } catch {
-        if (!line) return '';
+    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();
+  for (const fn of cleanups) fn();
-    cleanups = [];
+  cleanups = [];
 });
 
 describe('getCellDimensions', () => {
-    describe('v5 private API (mock _core._renderService)', () => {
+  describe('v5 private API (mock _core._renderService)', () => {
-        it('returns cell width and height from css.cell', () => {
+    it('returns cell width and height from css.cell', () => {
-            const mock = createMockTerminal({ cellWidth: 8.4, cellHeight: 19 });
+      const mock = createMockTerminal({ cellWidth: 8.4, cellHeight: 19 });
-            cleanups.push(mock.cleanup);
+      cleanups.push(mock.cleanup);
-            const dims = getCellDimensions(mock.terminal as unknown as XtermTerminal);
+      const dims = getCellDimensions(mock.terminal as unknown as XtermTerminal);
-            expect(dims).not.toBeNull();
+      expect(dims).not.toBeNull();
-            expect(dims!.width).toBe(8.4);
+      expect(dims!.width).toBe(8.4);
-            expect(dims!.height).toBe(19);
+      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('DPR simulation', () => {
+    it('returns charTop from device.char.top divided by DPR', () => {
-        const originalDPR = globalThis.devicePixelRatio;
+      const mock = createMockTerminal({
-
+        cellWidth: 8,
-        beforeEach(() => {
+        cellHeight: 19,
-            // Set DPR=2 to test division
+        deviceCharTop: 2,
-            Object.defineProperty(globalThis, 'devicePixelRatio', {
+      });
-                value: 2,
+      cleanups.push(mock.cleanup);
-                writable: true,
+      const dims = getCellDimensions(mock.terminal as unknown as XtermTerminal);
-                configurable: true,
+      expect(dims).not.toBeNull();
-            });
+      // DPR=1 in jsdom, so charTop = 2 / 1 = 2
-        });
+      expect(dims!.charTop).toBe(2);
-
-        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 charHeight from device.char.height divided by DPR', () => {
-        it('returns null for terminal without _core', () => {
+      const mock = createMockTerminal({
-            const terminal = {
+        cellWidth: 8,
-                element: document.createElement('div'),
+        cellHeight: 19,
-                cols: 80,
+        deviceCharHeight: 16,
-                rows: 24,
+      });
-                options: {},
+      cleanups.push(mock.cleanup);
-                buffer: { active: { viewportY: 0, baseY: 0, getLine: () => undefined } },
+      const dims = getCellDimensions(mock.terminal as unknown as XtermTerminal);
-            } as unknown as XtermTerminal;
+      expect(dims).not.toBeNull();
-            const dims = getCellDimensions(terminal);
+      // DPR=1, so charHeight = 16 / 1 = 16
-            expect(dims).toBeNull();
+      expect(dims!.charHeight).toBe(16);
-        });
-
-        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('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

@@ -0,0 +1,32 @@
+{"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"}
+{"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":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$ "}
+{"delayMs":635,"data":"exec codex\r\n"}
+{"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"}
+{"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;39H\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;39H\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;39H\u001b[K\u001b[16;80H\u001b[K\u001b[14;3H"}
+{"delayMs":158,"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-ruT16A\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-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"}
+{"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":3486,"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-ruT16A\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-ruT16A\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-ruT16A\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":199,"data":"h\u001b[K\u001b[20;80H\u001b[K\u001b[18;4H"}
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packages/xterm-zerolag-input/test/fixtures/codex/streaming-real.jsonl

@@ -0,0 +1,154 @@
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packages/xterm-zerolag-input/test/fixtures/codex/trust-modal.jsonl

@@ -0,0 +1,28 @@
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+{"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":28,"data":"\u001b[32m\u001b[1markon@tnode\u001b(B\u001b[m:\u001b[34m\u001b[1m~/default/claudeman-predictive/tmp/codexrec-work-X4gHpE\u001b(B\u001b[m$ "}
+{"delayMs":654,"data":"exec codex\r\n"}
+{"delayMs":486,"data":"\u001b[?25l\u001b[?12l\u001b[?25h"}
+{"delayMs":168,"data":"\u001b[30d\n\u001b[K\u001b[2d\u001b[J\u001b[H\u001b[K"}
+{"delayMs":2,"data":">\u001b[C\u001b[1mYou are in \u001b(B\u001b[m/home/arkon/default/claudeman-predictive/tmp/codexrec-work-X4gHpE\u001b[3;3H\u001b[33mNote: You’re in a subdirectory of a Git project. Trusting will apply to the repository root:\u001b[4;3H/home/arkon/default/claudeman\u001b[6;3H\u001b[39mDo\u001b[Cyou\u001b[Ctrust\u001b[Cthe\u001b[Ccontents\u001b[Cof\u001b[Cthis\u001b[Cdirectory?\u001b[CWorking\u001b[Cwith\u001b[Cuntrusted\u001b[Ccontents\u001b[Ccomes\u001b[Cwith\u001b[Chigher\u001b[7;3Hrisk\u001b[Cof\u001b[Cprompt\u001b[Cinjection.\u001b[CTrusting\u001b[Cthe\u001b[Cdirectory\u001b[Callows\u001b[Cproject-local\u001b[Cconfig,\u001b[Chooks,\u001b[Cand\u001b[Cexec\u001b[8;3Hpolicies\u001b[Cto\u001b[Cload.\u001b[10;1H\u001b[36m› 1. Yes, continue\u001b[11;3H\u001b[39m2.\u001b[CNo,\u001b[Cquit\u001b[13;3H\u001b[2mPress enter to continue\u001b[?25l\u001b(B\u001b[m"}
+{"delayMs":3659,"data":"\u001b[?7727h\u001b(B\u001b[m\u001b[?12l\u001b[?25h\u001b[1;1H\u001b[1;30r\u001b[13;26H\u001b[?25l"}
+{"delayMs":0,"data":"\u001b[H>\u001b[1X\u001b[1m\u001b[CYou are in \u001b(B\u001b[m/home/arkon/default/claudeman-predictive/tmp/codexrec-work-X4gHpE\u001b[K\r\n\u001b[K\u001b[3;2H\u001b[1K\u001b[33m\u001b[CNote: You’re in a subdirectory of a Git project. Trusting will apply to the repository root:\u001b[39m\u001b[K\u001b[4;2H\u001b[1K\u001b[33m\u001b[C/home/arkon/default/claudeman\u001b[39m\u001b[K\r\n\u001b[K\u001b[6;2H\u001b[1K\u001b[CDo\u001b[1X\u001b[Cyou\u001b[1X\u001b[Ctrust\u001b[1X\u001b[Cthe\u001b[1X\u001b[Ccontents\u001b[1X\u001b[Cof\u001b[1X\u001b[Cthis\u001b[1X\u001b[Cdirectory?\u001b[1X\u001b[CWorking\u001b[1X\u001b[Cwith\u001b[1X\u001b[Cuntrusted\u001b[1X\u001b[Ccontents\u001b[1X\u001b[Ccomes\u001b[1X\u001b[Cwith\u001b[1X\u001b[Chigher\u001b[K\u001b[7;2H\u001b[1K\u001b[Crisk\u001b[1X\u001b[Cof\u001b[1X\u001b[Cprompt\u001b[1X\u001b[Cinjection.\u001b[1X\u001b[CTrusting\u001b[1X\u001b[Cthe\u001b[1X\u001b[Cdirectory\u001b[1X\u001b[Callows\u001b[1X\u001b[Cproject-local\u001b[1X\u001b[Cconfig,\u001b[1X\u001b[Chooks,\u001b[1X\u001b[Cand\u001b[1X\u001b[Cexec\u001b[K\u001b[8;2H\u001b[1K\u001b[Cpolicies\u001b[1X\u001b[Cto\u001b[1X\u001b[Cload.\u001b[K\r\n\u001b[K\u001b[36m\r\n› 1. Yes, continue\u001b[39m\u001b[K\u001b[11;2H\u001b[1K\u001b[C2.\u001b[1X\u001b[CNo,\u001b[1X\u001b[Cquit\u001b[K\r\n\u001b[K\u001b[13;2H\u001b[1K\u001b[2m\u001b[CPress enter to continue\u001b(B\u001b[m\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[13;26H"}
+{"keyAt":true,"data":"x"}
+{"delayMs":188,"data":"\u001b[1;79H\u001b[K\u001b[3;95H\u001b[K\u001b[4;32H\u001b[K\u001b[6;97H\u001b[K\u001b[7;96H\u001b[K\u001b[8;20H\u001b[K\u001b[10;19H\u001b[K\u001b[11;14H\u001b[K\u001b[13;26H\u001b[K\u001b[30;2H"}
+{"keyAt":true,"data":"\r"}
+{"delayMs":849,"data":"\u001b[2;1H\u001b[J\u001b[H\u001b[K"}
+{"delayMs":0,"data":"\u001bM\u001bM\u001bM\r\n\u001b[33m⚠ Codex could not find bubblewrap on PATH. Install bubblewrap with your OS package manager. See the\r\n\u001b(B\u001b[m\u001b[1;3r\u001b[3;1H\n\u001b[A  \u001b[33msandbox prerequisites: https://developers.openai.com/codex/concepts/sandboxing#prerequisites.\u001b[39m\r\n\u001b[K\u001b[1;30r\u001b[3;1H"}
+{"delayMs":2,"data":"  \u001b[33mCodex will use the bundled bubblewrap in the meantime.\u001b[5;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-X4gHpE\u001b[2m │\r\n╰─────────────────────────────────────────────────╯\u001b[13;1H\u001b(B\u001b[m\u001b[1m›\u001b[C\u001b(B\u001b[m\u001b[2mImprove docum\u001b(B\u001b[m"}
+{"delayMs":0,"data":"\u001b[2mentation in @filename\u001b[15;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-X4gHpE\u001b[13;3H\u001b[?12l\u001b[?25h\u001b(B\u001b[m"}
+{"delayMs":7,"data":"\u001b[5;52H\u001b[K\n\u001b[K\n\u001b[K\n\u001b[K\n\u001b[K\n\u001b[K\u001b[13;37H\u001b[K\u001b[15;80H\u001b[K\u001b[13;3H"}
+{"delayMs":13,"data":"\u001b[5;52H\u001b[K\n\u001b[K\n\u001b[K\n\u001b[K\n\u001b[K\n\u001b[K\u001b[13;37H\u001b[K\u001b[15;80H\u001b[K\u001b[13;3H"}
+{"delayMs":165,"data":"\u001b[5;1H\u001b[J\u001b[A\u001b[K"}
+{"delayMs":0,"data":"\u001b[2B\u001b[1m›\u001b[C\u001b(B\u001b[m\u001b[2mImprove documentation in @filename\u001b[8;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-X4gHpE\u001b[6;3H\u001b(B\u001b[m"}
+{"delayMs":1,"data":"\u001b[34C\u001b[K\u001b[8;80H\u001b[K\u001b[6;3H"}
+{"delayMs":24,"data":"\u001b[4;30r\u001b[4;1H\u001bM\u001bM\u001bM\u001bM\u001bM\u001bM\u001bM\u001bM\u001bM\u001bM\u001bM\r\n\u001b[2m╭─────────────────────────────────────────────────╮\r\n│ >_ \u001b(B\u001b[m\u001b[1mOpenAI Codex\u001b(B\u001b[m\u001b[2m (v0.147.0)                      │\u001b[1;30r\u001b[7;1H\u001b(B\u001b[m"}
+{"delayMs":0,"data":"\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       │\r\n│ directory: \u001b(B\u001b[m~/default/…/tmp/codexrec-work-X4gHpE\u001b[2m │\r\n╰─────────────────────────────────────────────────╯\u001b[12;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[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

@@ -0,0 +1,33 @@
+{"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"}
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packages/xterm-zerolag-input/test/fixtures/codex/wrap.jsonl

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+{"delayMs":27,"data":"k\u001b[20;80H\u001b[K\u001b[18;52H"}
+{"keyAt":true,"data":"e"}
+{"delayMs":26,"data":"e\u001b[K\u001b[20;80H\u001b[K\u001b[18;53H"}
+{"delayMs":17,"data":"e\u001b[K\u001b[20;80H\u001b[K\u001b[18;54H"}
+{"keyAt":true,"data":"p"}
+{"delayMs":28,"data":"p\u001b[K\u001b[20;80H\u001b[K\u001b[18;55H"}
+{"keyAt":true,"data":"s"}
+{"delayMs":27,"data":"s\u001b[K\u001b[20;80H\u001b[K\u001b[18;56H"}
+{"keyAt":true,"data":" "}
+{"delayMs":27,"data":"\u001b[K\u001b[20;80H\u001b[K\u001b[18;57H"}
+{"keyAt":true,"data":"r"}
+{"keyAt":true,"data":"u"}
+{"delayMs":27,"data":"r\u001b[K\u001b[20;80H\u001b[K\u001b[18;58H"}
+{"delayMs":17,"data":"u\u001b[K\u001b[20;80H\u001b[K\u001b[18;59H"}
+{"keyAt":true,"data":"n"}
+{"delayMs":29,"data":"n\u001b[K\u001b[20;80H\u001b[K\u001b[18;60H"}
+{"keyAt":true,"data":"n"}
+{"delayMs":26,"data":"n\u001b[K\u001b[20;80H\u001b[K\u001b[18;61H"}
+{"keyAt":true,"data":"i"}
+{"delayMs":28,"data":"i\u001b[K\u001b[20;80H\u001b[K\u001b[18;62H"}
+{"keyAt":true,"data":"n"}
+{"delayMs":26,"data":"n\u001b[K\u001b[20;80H\u001b[K\u001b[18;63H"}
+{"keyAt":true,"data":"g"}
+{"keyAt":true,"data":" "}
+{"delayMs":45,"data":"g\u001b[K\u001b[20;80H\u001b[K\u001b[18;65H"}
+{"keyAt":true,"data":"u"}
+{"delayMs":28,"data":"u\u001b[K\u001b[20;80H\u001b[K\u001b[18;66H"}
+{"keyAt":true,"data":"n"}
+{"delayMs":27,"data":"n\u001b[K\u001b[20;80H\u001b[K\u001b[18;67H"}
+{"keyAt":true,"data":"t"}
+{"keyAt":true,"data":"i"}
+{"delayMs":27,"data":"t\u001b[K\u001b[20;80H\u001b[K\u001b[18;68H"}
+{"keyAt":true,"data":"l"}
+{"delayMs":45,"data":"il\u001b[K\u001b[20;80H\u001b[K\u001b[18;70H"}
+{"keyAt":true,"data":" "}
+{"delayMs":28,"data":"\u001b[K\u001b[20;80H\u001b[K\u001b[18;71H"}
+{"keyAt":true,"data":"t"}
+{"delayMs":26,"data":"t\u001b[K\u001b[20;80H\u001b[K\u001b[18;72H"}
+{"keyAt":true,"data":"h"}
+{"keyAt":true,"data":"e"}
+{"delayMs":28,"data":"h\u001b[K\u001b[20;80H\u001b[K\u001b[18;73H"}
+{"keyAt":true,"data":" "}
+{"delayMs":45,"data":"e\u001b[K\u001b[20;80H\u001b[K\u001b[18;75H"}
+{"keyAt":true,"data":"c"}
+{"delayMs":27,"data":"c\u001b[K\u001b[20;80H\u001b[K\u001b[18;76H"}
+{"keyAt":true,"data":"o"}
+{"delayMs":28,"data":"o\u001b[K\u001b[20;80H\u001b[K\u001b[18;77H"}
+{"keyAt":true,"data":"m"}
+{"keyAt":true,"data":"p"}
+{"delayMs":27,"data":"m\u001b[K\u001b[20;80H\u001b[K\u001b[18;78H"}
+{"delayMs":16,"data":"p\u001b[K\u001b[20;80H\u001b[K\u001b[18;79H"}
+{"keyAt":true,"data":"o"}
+{"delayMs":30,"data":"o\u001b[K\u001b[2B\u001b[K\u001b[2A"}
+{"keyAt":true,"data":"s"}
+{"delayMs":27,"data":"s\u001b[K\u001b[20;80H\u001b[K\u001b[18;81H"}
+{"keyAt":true,"data":"e"}
+{"delayMs":27,"data":"e\u001b[K\u001b[20;80H\u001b[K\u001b[18;82H"}
+{"keyAt":true,"data":"r"}
+{"delayMs":27,"data":"r\u001b[K\u001b[20;80H\u001b[K\u001b[18;83H"}
+{"keyAt":true,"data":" "}
+{"delayMs":16,"data":"\u001b[K\u001b[20;80H\u001b[K\u001b[18;84H"}
+{"keyAt":true,"data":"b"}
+{"delayMs":30,"data":"b\u001b[K\u001b[20;80H\u001b[K\u001b[18;85H"}
+{"keyAt":true,"data":"o"}
+{"delayMs":27,"data":"o\u001b[K\u001b[20;80H\u001b[K\u001b[18;86H"}
+{"keyAt":true,"data":"x"}
+{"delayMs":27,"data":"x\u001b[K\u001b[20;80H\u001b[K\u001b[18;87H"}
+{"keyAt":true,"data":" "}
+{"delayMs":26,"data":"\u001b[K\u001b[20;80H\u001b[K\u001b[18;88H"}
+{"keyAt":true,"data":"h"}
+{"delayMs":17,"data":"h\u001b[K\u001b[20;80H\u001b[K\u001b[18;89H"}
+{"keyAt":true,"data":"a"}
+{"delayMs":28,"data":"a\u001b[K\u001b[20;80H\u001b[K\u001b[18;90H"}
+{"keyAt":true,"data":"s"}
+{"delayMs":27,"data":"s\u001b[K\u001b[20;80H\u001b[K\u001b[18;91H"}
+{"keyAt":true,"data":" "}
+{"delayMs":28,"data":"\u001b[K\u001b[20;80H\u001b[K\u001b[18;92H"}
+{"keyAt":true,"data":"t"}
+{"delayMs":26,"data":"t\u001b[K\u001b[20;80H\u001b[K\u001b[18;93H"}
+{"keyAt":true,"data":"o"}
+{"keyAt":true,"data":" "}
+{"delayMs":27,"data":"o\u001b[K\u001b[20;80H\u001b[K\u001b[18;94H"}
+{"delayMs":16,"data":"\u001b[K\u001b[20;80H\u001b[K\u001b[18;95H"}
+{"keyAt":true,"data":"w"}
+{"delayMs":30,"data":"w\u001b[K\u001b[20;80H\u001b[K\u001b[18;96H"}
+{"keyAt":true,"data":"r"}
+{"delayMs":27,"data":"r\u001b[K\u001b[20;80H\u001b[K\u001b[18;97H"}
+{"keyAt":true,"data":"a"}
+{"delayMs":26,"data":"a\u001b[K\u001b[20;80H\u001b[K\u001b[18;98H"}
+{"keyAt":true,"data":"p"}
+{"delayMs":27,"data":"p\u001b[K\u001b[20;80H\u001b[K\u001b[18;99H"}
+{"keyAt":true,"data":" "}
+{"delayMs":27,"data":"\u001b[17;1H\u001b[J\u001b[A\u001b[K"}
+{"keyAt":true,"data":"t"}
+{"delayMs":1,"data":"\u001b[2B\u001b[1m›\u001b[C\u001b(B\u001b[mthe\u001b[Cquick\u001b[Cbrown\u001b[Cfox\u001b[Cjumps\u001b[Cover\u001b[Cthe\u001b[Clazy\u001b[Cdog\u001b[Cand\u001b[Ckeeps\u001b[Crunning\u001b[Cuntil\u001b[Cthe\u001b[Ccomposer\u001b[Cbox\u001b[Chas\u001b[Cto\u001b[Cwrap\u001b[21;3H\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[19;3H\u001b(B\u001b[m"}
+{"keyAt":true,"data":"h"}
+{"delayMs":42,"data":"\u001b[18;99H\u001b[K\u001b[19;3Hth\u001b[21;80H\u001b[K\u001b[19;5H"}
+{"keyAt":true,"data":"i"}
+{"delayMs":29,"data":"\u001b[18;99H\u001b[K\u001b[19;5Hi\u001b[K\u001b[21;80H\u001b[K\u001b[19;6H"}
+{"keyAt":true,"data":"s"}
+{"delayMs":27,"data":"\u001b[18;99H\u001b[K\u001b[19;6Hs\u001b[K\u001b[21;80H\u001b[K\u001b[19;7H"}
+{"keyAt":true,"data":" "}
+{"delayMs":27,"data":"\u001b[18;99H\u001b[K\u001b[19;7H\u001b[K\u001b[21;80H\u001b[K\u001b[19;8H"}
+{"keyAt":true,"data":"l"}
+{"delayMs":26,"data":"\u001b[18;99H\u001b[K\u001b[19;8Hl\u001b[K\u001b[21;80H\u001b[K\u001b[19;9H"}
+{"keyAt":true,"data":"i"}
+{"keyAt":true,"data":"n"}
+{"delayMs":45,"data":"\u001b[18;99H\u001b[K\u001b[19;9Hin\u001b[K\u001b[21;80H\u001b[K\u001b[19;11H"}
+{"keyAt":true,"data":"e"}
+{"delayMs":27,"data":"\u001b[18;99H\u001b[K\u001b[19;11He\u001b[K\u001b[21;80H\u001b[K\u001b[19;12H"}
+{"keyAt":true,"data":" "}
+{"delayMs":27,"data":"\u001b[18;99H\u001b[K\u001b[19;12H\u001b[K\u001b[21;80H\u001b[K\u001b[19;13H"}
+{"keyAt":true,"data":"t"}
+{"delayMs":27,"data":"\u001b[18;99H\u001b[K\u001b[19;13Ht\u001b[K\u001b[21;80H\u001b[K\u001b[19;14H"}
+{"keyAt":true,"data":"w"}
+{"keyAt":true,"data":"i"}
+{"delayMs":45,"data":"\u001b[18;99H\u001b[K\u001b[19;14Hwi\u001b[K\u001b[21;80H\u001b[K\u001b[19;16H"}
+{"keyAt":true,"data":"c"}
+{"delayMs":28,"data":"\u001b[18;99H\u001b[K\u001b[19;16Hc\u001b[K\u001b[21;80H\u001b[K\u001b[19;17H"}
+{"keyAt":true,"data":"e"}
+{"delayMs":26,"data":"\u001b[18;99H\u001b[K\u001b[19;17He\u001b[K\u001b[21;80H\u001b[K\u001b[19;18H"}
+{"keyAt":true,"data":" "}
+{"keyAt":true,"data":"o"}
+{"delayMs":28,"data":"\u001b[18;99H\u001b[K\u001b[19;18H\u001b[K\u001b[21;80H\u001b[K\u001b[19;19H"}
+{"keyAt":true,"data":"v"}
+{"delayMs":26,"data":"\u001b[18;99H\u001b[K\u001b[19;19Ho\u001b[K\u001b[21;80H\u001b[K\u001b[19;20H"}
+{"keyAt":true,"data":"e"}
+{"delayMs":26,"data":"\u001b[18;99H\u001b[K\u001b[19;20Hv\u001b[K\u001b[21;80H\u001b[K\u001b[19;21H"}
+{"delayMs":17,"data":"\u001b[18;99H\u001b[K\u001b[19;21He\u001b[K\u001b[21;80H\u001b[K\u001b[19;22H"}
+{"keyAt":true,"data":"r"}
+{"delayMs":29,"data":"\u001b[18;99H\u001b[K\u001b[19;22Hr\u001b[K\u001b[21;80H\u001b[K\u001b[19;23H"}

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[];
+  lines: string[];
-    viewportY?: number;
+  viewportY?: number;
-    baseY?: number;
+  baseY?: number;
-    cursorX?: number;
+  cursorX?: number;
-    cursorY?: number;
+  cursorY?: number;
 }
 
 interface MockTerminalOptions {
-    buffer?: MockBufferOptions;
+  buffer?: MockBufferOptions;
-    cols?: number;
+  cols?: number;
-    rows?: number;
+  rows?: number;
-    fontFamily?: string;
+  fontFamily?: string;
-    fontSize?: number;
+  fontSize?: number;
-    fontWeight?: string | number;
+  fontWeight?: string | number;
-    theme?: {
+  theme?: {
-        background?: string;
+    background?: string;
-        foreground?: string;
+    foreground?: string;
-        cursor?: string;
+    cursor?: string;
-    };
+  };
-    cellWidth?: number;
+  cellWidth?: number;
-    cellHeight?: number;
+  cellHeight?: number;
-    /** Device-pixel char top offset (for charTop calculation). Default: 0 */
+  /** Device-pixel char top offset (for charTop calculation). Default: 0 */
-    deviceCharTop?: number;
+  deviceCharTop?: number;
-    /** Device-pixel char height (for charHeight calculation). Default: cellHeight * dpr */
+  /** Device-pixel char height (for charHeight calculation). Default: cellHeight * dpr */
-    deviceCharHeight?: number;
+  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 bufOpts = opts.buffer ?? { lines: ['$ '] };
-    const lines = bufOpts.lines;
+  const viewportY = bufOpts.viewportY ?? 0;
-    const viewportY = bufOpts.viewportY ?? 0;
+  const baseY = bufOpts.baseY ?? viewportY;
-    const baseY = bufOpts.baseY ?? viewportY;
+  const cols = opts.cols ?? 80;
-    const cols = opts.cols ?? 80;
+  const rows = opts.rows ?? Math.max(bufOpts.lines.length, 24);
-    const rows = opts.rows ?? Math.max(lines.length, 24);
+  const cellW = opts.cellWidth ?? 8.4;
-    const cellW = opts.cellWidth ?? 8.4;
+  const cellH = opts.cellHeight ?? 17;
-    const cellH = opts.cellHeight ?? 17;
+  const getCellSupport = opts.getCellSupport ?? true;
+  const emitters = opts.emitters ?? true;
 
-    const mockLines: MockLine[] = lines.map((text) => ({
+  const makeLine = (text: string): { line: MockLine; set(t: string): void } => {
-        translateToString: () => text,
+    let current = text;
-    }));
+    const line: MockLine = {
-
+      translateToString: () => current,
-    // 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);
-        },
     };
+    if (getCellSupport) {
+      line.getCell = (x: number) => cellAt(current, x);
+    }
+    return { line, set: (t: string) => (current = t) };
+  };
 
-    return {
+  let mockLines = bufOpts.lines.map(makeLine);
-        terminal,
+
-        /** Update buffer lines for subsequent calls */
+  // Create minimal DOM structure
-        setLines(newLines: string[]) {
+  const element = document.createElement('div');
-            mockLines.length = 0;
+  element.className = 'terminal xterm';
-            for (const text of newLines) {
+
-                mockLines.push({ translateToString: () => text });
+  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', () => {
+  describe('character strategy', () => {
-        it('finds $ prompt at column 0', () => {
+    it('finds $ prompt at column 0', () => {
-            const { terminal, cleanup } = term(['output line', '$ ls -la']);
+      const { terminal, cleanup } = term(['output line', '$ ls -la']);
-            const finder: PromptFinder = { type: 'character', char: '$' };
+      const finder: PromptFinder = { type: 'character', char: '$' };
-            const pos = findPrompt(terminal as unknown as XtermTerminal, finder);
+      const pos = findPrompt(terminal as unknown as XtermTerminal, finder);
-            expect(pos).toEqual({ row: 1, col: 0 });
+      expect(pos).toEqual({ row: 1, col: 0 });
-            cleanup();
+      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('regex strategy', () => {
+    it('finds > prompt', () => {
-        it('finds regex prompt', () => {
+      const { terminal, cleanup } = term(['> hello']);
-            const { terminal, cleanup } = term(['user@host:~/dir$ ls']);
+      const finder: PromptFinder = { type: 'character', char: '>' };
-            const finder: PromptFinder = { type: 'regex', pattern: /\$/ };
+      const pos = findPrompt(terminal as unknown as XtermTerminal, finder);
-            const pos = findPrompt(terminal as unknown as XtermTerminal, finder);
+      expect(pos).toEqual({ row: 0, col: 0 });
-            expect(pos).not.toBeNull();
+      cleanup();
-            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('finds prompt with prefix (user@host)', () => {
-        it('uses custom finder function', () => {
+      const { terminal, cleanup } = term(['user@host:~$ command']);
-            const { terminal, cleanup } = term(['anything']);
+      const finder: PromptFinder = { type: 'character', char: '$' };
-            const finder: PromptFinder = {
+      const pos = findPrompt(terminal as unknown as XtermTerminal, finder);
-                type: 'custom',
+      expect(pos).toEqual({ row: 0, col: 11 });
-                find: () => ({ row: 5, col: 10 }),
+      cleanup();
-            };
-            const pos = findPrompt(terminal as unknown as XtermTerminal, finder);
-            expect(pos).toEqual({ row: 5, col: 10 });
-            cleanup();
-        });
-
-        it('handles null from custom finder', () => {
-            const { terminal, cleanup } = term(['anything']);
-            const finder: PromptFinder = {
-                type: 'custom',
-                find: () => null,
-            };
-            const pos = findPrompt(terminal as unknown as XtermTerminal, finder);
-            expect(pos).toBeNull();
-            cleanup();
-        });
     });
+
+    it('scans bottom-up and returns lowest match', () => {
+      const { terminal, cleanup } = term(['$ 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', () => {
+  it('reads text after prompt with offset', () => {
-        const { terminal, cleanup } = term(['$ hello world']);
+    const { terminal, cleanup } = term(['$ hello world']);
-        const prompt = { row: 0, col: 0 };
+    const prompt = { row: 0, col: 0 };
-        const text = readTextAfterPrompt(terminal as unknown as XtermTerminal, prompt, 2);
+    const text = readTextAfterPrompt(terminal as unknown as XtermTerminal, prompt, 2);
-        expect(text).toBe('hello world');
+    expect(text).toBe('hello world');
-        cleanup();
+    cleanup();
-    });
+  });
 
-    it('returns empty string for empty prompt line', () => {
+  it('returns empty string for empty prompt line', () => {
-        const { terminal, cleanup } = term(['$ ']);
+    const { terminal, cleanup } = term(['$ ']);
-        const prompt = { row: 0, col: 0 };
+    const prompt = { row: 0, col: 0 };
-        const text = readTextAfterPrompt(terminal as unknown as XtermTerminal, prompt, 2);
+    const text = readTextAfterPrompt(terminal as unknown as XtermTerminal, prompt, 2);
-        expect(text).toBe('');
+    expect(text).toBe('');
-        cleanup();
+    cleanup();
-    });
+  });
 
-    it('trims trailing whitespace', () => {
+  it('trims trailing whitespace', () => {
-        const { terminal, cleanup } = term(['$ hello   ']);
+    const { terminal, cleanup } = term(['$ hello   ']);
-        const prompt = { row: 0, col: 0 };
+    const prompt = { row: 0, col: 0 };
-        const text = readTextAfterPrompt(terminal as unknown as XtermTerminal, prompt, 2);
+    const text = readTextAfterPrompt(terminal as unknown as XtermTerminal, prompt, 2);
-        expect(text).toBe('hello');
+    expect(text).toBe('hello');
-        cleanup();
+    cleanup();
-    });
+  });
 
-    it('handles offset for complex prompts', () => {
+  it('handles offset for complex prompts', () => {
-        const { terminal, cleanup } = term(['user@host:~$ ls -la']);
+    const { terminal, cleanup } = term(['user@host:~$ ls -la']);
-        const prompt = { row: 0, col: 11 };
+    const prompt = { row: 0, col: 11 };
-        const text = readTextAfterPrompt(terminal as unknown as XtermTerminal, prompt, 2);
+    const text = readTextAfterPrompt(terminal as unknown as XtermTerminal, prompt, 2);
-        expect(text).toBe('ls -la');
+    expect(text).toBe('ls -la');
-        cleanup();
+    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'));

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.
+        // plain PTY echo like shell — visually augmented by the predictive
-        // Disable it by clearing any pending text.
+        // 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

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/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 ────────────────────────────────────