whisper_web/docs/plans/001-0-coordination.md

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status: in-progress
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# 001 — Transcription quality and speed: coordination plan

> **For agentic workers:** this file coordinates seven parallel workstreams. Each workstream writes
> its own task plan (`docs/plans/001-<n>-<slug>.md`, superpowers:writing-plans format) in its own
> worktree and executes it with TDD (superpowers:executing-plans, inline — no nested subagents).

**Goal:** implement spec 001 as seven independently mergeable branches.

**Spec:** `docs/specs/001-transcription-quality-and-speed.md` (approved). Read it, `AGENTS.md`,
`PRODUCT.md`, and the `docs/Decisions.md` entries your workstream touches before planning.

## Workstreams

| # | Branch | Plan file | Owns |
|---|---|---|---|
| 1 | `chore/transformers-4.3` | `001-1-transformers-upgrade.md` | `package.json`, `bun.lock`, `patches/`, re-tests of D-014/D-021/D-022/D-026 |
| 2 | `feat/vocabulary-hint` | `001-2-vocabulary-hint.md` | hint UI + storage, `prompt` through protocol/worker/live/server |
| 3 | `feat/longform-pipeline` | `001-3-longform-pipeline.md` | `src/worker/longform/` (VAD, guard, fallback, language pinning), progress tracker |
| 4 | `feat/translate` | `001-4-translate.md` | `canTranslate`, translate UI, Opus-MT text translation |
| 5 | `feat/server-batched-vad` | `001-5-server-batched-vad.md` | `server-py/sidecar.py` |
| 6 | `feat/danish-models` | `001-6-danish-models.md` | conversions (outside repo), catalog entries |
| 7 | `feat/parakeet-engine` | `001-7-parakeet.md` | Parakeet engine path + catalog entry |

All branch from `docs/transcription-improvements-spec` (spec commit) on Transformers.js **4.2.0**.
The integrator merges in this order, rebasing/fixing up each onto the result of the previous:
**1 → 4 → 6 → 5 → 2 → 3 → 7.**

## Shared interfaces (fixed here so parallel branches agree)

- `src/lib/models.ts` — `WhisperModel` gains (by workstream 4) `canTranslate: boolean`. Workstream 6
  does **not** add it (it doesn't exist on its base); the integrator sets it to `false` for the new
  Danish entries at merge.
- `src/worker/protocol.ts` — the transcribe message gains (workstream 2) `prompt?: string` (the raw
  user hint; the worker tokenizes and truncates it). Live and server paths carry the same field name.
- `src/worker/longform/` (workstream 3) exposes
  `transcribeLongForm(audio: Float32Array, deps: LongFormDeps, options: LongFormOptions): Promise<LongFormResult>`
  where `LongFormOptions` includes `language?: string`, `task?: WhisperTask`, and `prompt?: string`
  (accepted and passed to every decode even before workstream 2 lands — a no-op when undefined).
- **Synthetic meeting stand-in** (workstream 3 owns it): a test helper that builds it at test time
  from the existing clips — `tests/meetingFixture.ts` exporting
  `buildMeetingFixture(): Promise<{ audio: Float32Array; reference: string }>` (16 kHz mono; clips
  joined with 2–8 s silences, `en_alien` excerpts included). Other workstreams may import it after
  merge; before that they measure on the plain clips.
- Parakeet (workstream 7) selects its engine from a catalog field it adds:
  `family?: "whisper" | "parakeet"` (absent ⇒ `"whisper"`), so existing entries need no edit.

## Global constraints (every workstream)

- `AGENTS.md` rules apply in full (Bun only, COEP/no CDN, colour tokens, DI on server modules,
  `classifyError`, runtime-env config, TDD, docs duties).
- **Decision ids:** don't take real `D-###` numbers. Write new entries as `## D-WS<n><letter> — …`
  (e.g. `D-WS3a`) and cite the same placeholder in code comments; the integrator renumbers at merge.
- **Heavy jobs take turns.** This machine has 16 cores / 18 GB RAM shared by all workstreams. Wrap
  every heavy command — real-model tests, the full `bun test`, benchmarks, model downloads,
  conversions, `pip install` — in `flock /tmp/whisper-heavy.lock <command>`. Light commands
  (typecheck, the fast suite, single unit tests, build) run without the lock.
- **Shared model cache.** After `bun install --frozen-lockfile` in your worktree, replace
  `node_modules/@huggingface/transformers/.cache` with a symlink to
  `/home/user/whisper_web/node_modules/@huggingface/transformers/.cache` (727 MB of turbo weights
  already there). Never delete anything in it.
- **Ports:** dev/prod servers use `PORT=31<n>0`–`31<n>9` for workstream `<n>`.
- **Python:** virtualenvs live in `/home/user/venvs/<name>`, never in the repo.
- **Nothing leaves this machine:** no `git push`, no Hugging Face uploads, no publishing.
- **Measurements** (wall-clock, WER vs `tests/audio_files/*.txt`, generated-token counts) are
  CPU/WASM or onnxruntime-node numbers; say so. Anything synthetic is labelled synthetic.
  WebGPU-dependent effects go in the final report as "needs owner's browser check".
- **Done per workstream:** `bun run typecheck`, fast suite, `bun run build` green; affected
  real-model tests green (under the lock); docs duties done; plan file removed with `git rm` as the
  last commit; branch left committed in its worktree, not merged.

## Review Focus (inputs the spec implies but no single test obviously covers)

1. **A 90-minute file** (the owner's real case): no full-length copies of the audio per stage, no
   per-window state that grows unbounded. Owner: 3 (pipeline), 2 (prompt repeated per window).
2. **A very long hint** (more than Whisper's ~224-token prompt budget): truncated predictably,
   never an error or a garbled first window. Owner: 2.
3. **Offline / VAD model never downloaded:** file transcription still works on the old path, with no
   network request. Owner: 3.
4. **Silence-only or music-only audio:** empty transcript with a clear message, no hang, no
   hallucinated text. Owner: 3.
5. **Translating a long transcript** (beyond Opus-MT's 512-token input): split on sentence
   boundaries, order preserved, nothing dropped. Owner: 4.

## Integration (integrator only)

- [ ] Merge 1, 4, 6, 5, 2, 3, 7 in order; renumber `D-WS*` placeholders to the next free `D-###`.
- [ ] After each merge: typecheck, fast suite, build; after the last: full `bun test` under the lock.
- [ ] Workstream 6: present the would-be Hugging Face publication to the owner; publish only on go.
- [ ] Final report to the owner: decisions made, measurements, items needing a browser check.