Merge feat/parakeet-engine: Parakeet TDT 0.6B v3 English engine (spec 001 workstream 7)

Co-Authored-By: Claude Opus 5.5 <[email protected]>

# Conflicts:
#	AGENTS.md
#	bun.lock
#	docs/Decisions.md
#	src/lib/models.ts
#	src/worker/inference.worker.ts
#	src/worker/protocol.ts
#	tests/models.test.ts

docs/WorkBreakdown.md

@@ -372,6 +372,22 @@ cached.
 
 ---
 
+## Spec 001 Goal 7 — Parakeet TDT 0.6B v3 (English, desktop, D-WS7a)
+- [x] Runtime decision: Transformers.js 4.2.0/4.3.2 have CTC-only Parakeet → parakeet.js on the
+      shared onnxruntime-web (one runtime in the bundle, `tests/workerBundle.test.ts`).
+- [x] Catalog `family` + exact sizes; worker engine path (≤ 30 s windows, word → chunk
+      timestamps, progress/partials); Cache-API downloader (`modelFiles.ts`).
+- [x] File and live mode; WASM int8 baseline; explicit WebGPU = fp16 encoder (opt-in only).
+- [x] Hidden on phones/tablets; English-only note instead of language/task controls.
+- [x] Real-model WER/wall-clock vs Large v3 Turbo (CPU), opt-in `PARAKEET_REAL=1` test.
+- [x] Headless Chrome (no GPU, fresh profile, prod build, COOP/COEP on): picking Parakeet and
+      dropping `en_aiproblem.m4a` downloaded the weights, cached them ("available offline"),
+      ran on WASM (12 threads) and showed the transcript, 2 timestamp segments and the
+      .txt/.srt/.txt+ts/Copy exports — 15 s end to end including the ~670 MB download. Picker
+      screenshots: desktop light/dark show the row + English-only note; a phone UA hides it.
+- [ ] Owner's browser check: real Chrome WASM load/transcribe (speed, memory), explicit
+      WebGPU on a real GPU (works? faster than WASM? fallback restart), Firefox/Safari WASM.
+
 ## Deliberately out of scope (for now)
 Arbitrary Hub model ids, OAuth providers, multi-user transcript storage,
 whisper.cpp server backend, i18n of the UI.
@@ -433,6 +449,11 @@ Found while building the long-form pipeline (spec 001 Goal 3, D-WS3a), 2026-10-2
       `en_alien`'s reference; `tests/meetingFixture.ts` returns audio + reference
       only. Add the list when the vocabulary hint (workstream 2) lands.
 
+- [ ] Parakeet v3 also transcribes 24 other European languages, Danish included, but the app
+      offers it English-only (spec 001) — unmeasured on `da_festuge`. Candidate for a later spec.
+- [ ] parakeet.js still logs `[Parakeet.js]` lines to the worker console on some paths; harmless,
+      not silenced (no logger hook in the library).
+
 ## Recurring
 - [ ] Maintain `AGENTS.md`:
   - **Add a rule only in response to a real failure.** When an agent repeatedly