Add full source parity validation workflow

docs/tasks/WBV2-P1128-000.md

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+# WBV2-P1128-000: ffmpeg.wasm movie codec module
+
+- task: `WBV2-P1128-000`
+- parent: `WBV2-P1127-000`
+- status: `done`
+- gap: `workflow:sequencer_movie_codec`
+- ownerFamily: `MEDIA`
+- targetImplementationClass: `LOCAL_BOUNDED`
+
+## 目标
+
+使用本地 ffmpeg.wasm Worker 作为 Chromium HTML media 解码失败时的 MOVIE probe/proxy fallback；核心 JS/WASM 同源懒加载，输入和输出均 hash-bound。
+
+## 输入与范围
+
+- Dependencies: `web/package.json`, `web/package-lock.json`
+- Protocol: `web/protocol/sequencer.ts`
+- Runtime: `web/app/src/sequencer/SequencerCodecProbe.ts`, `web/app/src/sequencer/FFmpegMovieProbe.ts`, `web/app/src/sequencer/ffmpeg-movie-probe.worker.ts`, `web/app/src/sequencer/SequencerMediaProxyCache.ts`
+- Local core: `web/app/src/vendor/ffmpeg/ffmpeg-core.js`, `web/app/src/vendor/ffmpeg/ffmpeg-core.wasm`, `web/app/public/vendor/ffmpeg/ffmpeg-core.js`, `web/app/public/vendor/ffmpeg/ffmpeg-core.wasm`
+- Upstream source: `third_party/ffmpeg.wasm-source-f876f907c7e9b9bf51d4ed0b913a855a63ae63fc.tar.gz`
+- Production test: `web/tests/e2e/ffmpeg-movie-probe-production.spec.ts`
+
+## 验收
+
+```bash
+npm --prefix web run typecheck
+npm --prefix web run build
+WEB_TEST_PORT=5342 npm --prefix web run test:e2e -- --workers=1 tests/e2e/ffmpeg-movie-probe-production.spec.ts
+```
+
+必须记录原生 HTML media 失败后的 ffmpeg.wasm 正例、metadata/frame 输出、损坏/identity/runtime 负例、AbortSignal cancellation、Worker termination、cache manifest identity 和 Chromium。历史 M11 MOVIE golden 不重写；H.264/浏览器解码差异留在新 capability receipt。
+
+## 交付与回滚
+
+- Receipt: `tests/golden/WBV2-P1128-000/module-receipt.json`
+- Manifest: `tests/golden/WBV2-P1128-000/manifest.json`
+- Status: `docs/status/WBV2-P1128-000.md`
+- 回滚：恢复 P1127 manifest 为 queue parent，保留 ffmpeg 源码下载和依赖变更供后续复用。