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feat(predictive-echo): PredictiveEchoAddon + Layers 1-3 test suites (0.2.0)

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Mosh-style write-through prediction: the consumer sends every keystroke
unchanged; the addon paints predicted glyphs and reconciles against the
parsed buffer. Confirm = cell match + cursor advance (placeholder-safe,
repaint-safe); two-pass mismatch cascade with neutral blanks (measured:
codex clears its placeholder on first echo); TTL bound; baseY-based line
reads; scroll/resize/off-row clears. Zero edits to zerolag-input-addon.ts.

Tests: 30 addon-law specs + renderer geometry (fake performance clock for
TTL/grace), 6 replay suites running the real algorithm through a real
@xterm/headless parser fed by the recorded codex fixtures, and a
500-iteration seeded fuzz with per-op span/record + grid invariants.
227 total, the pre-existing 175 untouched.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Codeman maintainer
2026-08-09 04:25:24 +02:00
parent 5aa59c70cc
commit a30524060a
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packages/xterm-zerolag-input/CHANGELOG.md
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# 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.
- 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