diff --git a/docs/predictive-echo-plan.md b/docs/predictive-echo-plan.md
new file mode 100644
index 00000000..bb1e3623
--- /dev/null
+++ b/docs/predictive-echo-plan.md
@@ -0,0 +1,135 @@
+# 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).
+- **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.
diff --git a/package-lock.json b/package-lock.json
index 6e00a6f8..9989577c 100644
--- a/package-lock.json
+++ b/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",
diff --git a/packages/xterm-zerolag-input/package.json b/packages/xterm-zerolag-input/package.json
index 48538c0d..584309bb 100644
--- a/packages/xterm-zerolag-input/package.json
+++ b/packages/xterm-zerolag-input/package.json
@@ -50,6 +50,7 @@
     "directory": "packages/xterm-zerolag-input"
   },
   "devDependencies": {
+    "@xterm/headless": "^6.0.0",
     "jsdom": "^24.1.3",
     "tsup": "^8.5.1",
     "typescript": "^5.5.0",
diff --git a/packages/xterm-zerolag-input/src/prediction-renderer.ts b/packages/xterm-zerolag-input/src/prediction-renderer.ts
new file mode 100644
index 00000000..888e6791
--- /dev/null
+++ b/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();
+}
diff --git a/packages/xterm-zerolag-input/src/types.ts b/packages/xterm-zerolag-input/src/types.ts
index 08dd0050..dedd7ca5 100644
--- a/packages/xterm-zerolag-input/src/types.ts
+++ b/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 };
 }
 
 /**
diff --git a/packages/xterm-zerolag-input/test/fixtures/codex/paste-bracketed.jsonl b/packages/xterm-zerolag-input/test/fixtures/codex/paste-bracketed.jsonl
new file mode 100644
index 00000000..02dd0bac
--- /dev/null
+++ b/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"}
diff --git a/packages/xterm-zerolag-input/test/fixtures/codex/slash-picker.jsonl b/packages/xterm-zerolag-input/test/fixtures/codex/slash-picker.jsonl
new file mode 100644
index 00000000..df2148d1
--- /dev/null
+++ b/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"}
diff --git a/packages/xterm-zerolag-input/test/fixtures/codex/streaming-burst.jsonl b/packages/xterm-zerolag-input/test/fixtures/codex/streaming-burst.jsonl
new file mode 100644
index 00000000..22dd53a5
--- /dev/null
+++ b/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"}
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diff --git a/packages/xterm-zerolag-input/test/fixtures/codex/trust-modal.jsonl b/packages/xterm-zerolag-input/test/fixtures/codex/trust-modal.jsonl
new file mode 100644
index 00000000..c8c41833
--- /dev/null
+++ b/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"}
diff --git a/packages/xterm-zerolag-input/test/fixtures/codex/type-hello.jsonl b/packages/xterm-zerolag-input/test/fixtures/codex/type-hello.jsonl
new file mode 100644
index 00000000..505aac85
--- /dev/null
+++ b/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"}
+{"delayMs":3484,"data":"\u001b[?7727h\u001b(B\u001b[m\u001b[?12l\u001b[?25h\u001b[1;1H\u001b[1;30r\u001b[18;3H"}
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diff --git a/packages/xterm-zerolag-input/test/fixtures/codex/wrap.jsonl b/packages/xterm-zerolag-input/test/fixtures/codex/wrap.jsonl
new file mode 100644
index 00000000..17bdc056
--- /dev/null
+++ b/packages/xterm-zerolag-input/test/fixtures/codex/wrap.jsonl
@@ -0,0 +1,250 @@
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+{"delayMs":28,"data":"d\u001b[K\u001b[20;80H\u001b[K\u001b[18;50H"}
+{"keyAt":true,"data":" "}
+{"delayMs":26,"data":"\u001b[K\u001b[20;80H\u001b[K\u001b[18;51H"}
+{"keyAt":true,"data":"k"}
+{"keyAt":true,"data":"e"}
+{"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"}
diff --git a/scripts/dev/analyze-codex-frames.mjs b/scripts/dev/analyze-codex-frames.mjs
new file mode 100644
index 00000000..0285c465
--- /dev/null
+++ b/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);
diff --git a/scripts/dev/record-codex-frames.mjs b/scripts/dev/record-codex-frames.mjs
new file mode 100644
index 00000000..76feff38
--- /dev/null
+++ b/scripts/dev/record-codex-frames.mjs
@@ -0,0 +1,190 @@
+#!/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: '' },
+  ],
+  // 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 ${scenario}`);
+  const steps = Array.isArray(spec) ? spec : spec.steps;
+  const trusted = Array.isArray(spec) ? true : (spec.trusted ?? true);
+
+  mkdirSync(SCRATCH, { recursive: true });
+  const lab = mkdtempSync(join(SCRATCH, 'codexrec-'));
+  writeFileSync(join(lab, 'auth.json'), JSON.stringify({ OPENAI_API_KEY: FAKE_KEY }));
+  const workdir = mkdtempSync(join(SCRATCH, 'codexrec-work-'));
+  if (trusted) {
+    // Pre-trust the workdir so boot goes straight to the composer instead of
+    // the first-run trust dialog (which trust-modal records deliberately).
+    writeFileSync(join(lab, 'config.toml'), `[projects."${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: { ...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 ${scenario} leaked the lab path; NOT writing`);
+
+  mkdirSync(outDir, { recursive: true });
+  const meta = { scenario, cols: COLS, rows: ROWS, codexVersion, recordedAt: new Date().toISOString() };
+  const out = join(outDir, `${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);
+}