diff --git a/.planning/ROADMAP.md b/.planning/ROADMAP.md index 0f6ae5f..80ffa2a 100644 --- a/.planning/ROADMAP.md +++ b/.planning/ROADMAP.md @@ -71,7 +71,7 @@ directory + `vite.config.ts` inline string + `src/background/`. - [x] 01-02-PLAN.md — Wave-0 test infrastructure: Vitest install + 4 RED test files + fixtures placeholder - [x] 01-03-PLAN.md — Offscreen recorder TDD: ring buffer + codec strict-mode + getDisplayMedia + track-ended cleanup; D-13 fallback skeleton pre-staged - [x] 01-04-PLAN.md — Port keepalive + OFFSCREEN_READY handshake (TDD): replaces alarms keepalive on offscreen side -- [ ] 01-05-PLAN.md — SW shrink: delete legacy buffer + alarms + IndexedDB + tabCapture paths; wire SW-side onConnect host +- [x] 01-05-PLAN.md — SW shrink: delete legacy buffer + alarms + IndexedDB + tabCapture paths; wire SW-side onConnect host - [ ] 01-06-PLAN.md — Build pipeline collapse: delete vite.config.ts inline plugin + top-level offscreen/ dir; declare rollupOptions.input - [ ] 01-07-PLAN.md — Manual smoke + ffprobe D-12 acceptance gate; commit regression fixture diff --git a/.planning/STATE.md b/.planning/STATE.md index 627e504..3743955 100644 --- a/.planning/STATE.md +++ b/.planning/STATE.md @@ -3,15 +3,15 @@ gsd_state_version: 1.0 milestone: v2.0.0 milestone_name: milestone status: executing -stopped_at: Completed Plan 01-04 — port keepalive + OFFSCREEN_READY handshake GREEN (9/9 tests pass); Plan 05 next (SW shrink + onConnect host with T-1-04 sender check) -last_updated: "2026-05-15T15:53:24.264Z" +stopped_at: Completed Plan 01-05 — SW shrink + onConnect host wired (T-1-04 sender check, OFFSCREEN_READY handshake, port-based buffer fetch, IDB orphan cleanup, hasDocument re-sync); 9/9 tests still green; Plan 06 next (vite.config.ts collapse) +last_updated: "2026-05-15T16:06:29.434Z" last_activity: 2026-05-15 progress: total_phases: 5 completed_phases: 0 total_plans: 7 - completed_plans: 4 - percent: 57 + completed_plans: 5 + percent: 71 --- # Project State @@ -28,12 +28,12 @@ no server, no password leaks. ## Current Position Phase: 1 (Stabilize Video Pipeline) — EXECUTING -Plan: 5 of 7 +Plan: 6 of 7 Status: Ready to execute Last activity: 2026-05-15 REQUIREMENTS.md, ROADMAP.md, STATE.md written) -Progress: [██████░░░░] 57% +Progress: [███████░░░] 71% ## Performance Metrics @@ -63,6 +63,7 @@ Progress: [██████░░░░] 57% | Phase 01 P02 | 4min | 5 tasks | 8 files | | Phase 1 P03 | 8min | 3 tasks | 5 files | | Phase 01 P04 | 4min | 3 tasks | 1 files | +| Phase 01 P05 | 8min | 2 tasks | 1 files | ## Accumulated Context @@ -92,6 +93,11 @@ current work: - [Phase 01-04]: Kept Plan 03's defensive bootstrap guard (typeof chrome / per-API existence checks) instead of Plan 04's verbatim unguarded block — Plan 04's verbatim block regressed ring-buffer and codec-check tests (they don't stub full chrome surface); restored guard preserves Plan 02 RED contract while satisfying Plan 04's new GREEN contract. Rule 1 deviation. - [Phase 01-04]: T-1-04 SW-side sender check documented redundantly (4 places in recorder.ts) for Plan 05 executor visibility — Offscreen is trusting party; SW is validating party. Documenting in module header, port-name constant, threat-mitigation comment near bootstrap, and inline at connectPort makes the contract impossible to miss when grepping for T-1-04 during Plan 05. - [Phase 01-04]: REFACTOR pass NOT skipped: stale 'Plan 04 wires this' comments replaced with actual D-17/Pattern 5 citations — Forward-pointing TODO-style comments became misleading after the work landed; minimal correctness-preserving comment update with all 9 tests still GREEN. +- [Phase ?]: [Phase 01-05]: Deleted broken checkPermissions / requestPermissions flow (Rule 1) +- [Phase ?]: [Phase 01-05]: REQUEST_PERMISSIONS collapsed — under getDisplayMedia (D-01) no runtime perm check is meaningful; the broken 'tabCapture' permission check was sending recording-start into the never-granted branch +- [Phase ?]: [Phase 01-05]: Added chrome.offscreen.hasDocument() in initialize() — Rule 2 robustness, audit P1 #8 mitigation across SW respawns +- [Phase ?]: [Phase 01-05]: SW is now a pure coordinator — onConnect host bound to 'video-keepalive' port with T-1-04 sender check; getVideoBufferFromOffscreen replaces synchronous SW-local buffer fetch; OFFSCREEN_READY handshake closes the audit P1 #12 race +- [Phase ?]: [Phase 01-05]: indexedDB.deleteDatabase('VideoRecorderDB') in onInstalled — T-1-NEW-05-02 / RESEARCH.md Runtime State Inventory cleanup of orphaned IDB from pre-Phase-01 builds ### Pending Todos @@ -114,7 +120,7 @@ Items acknowledged and carried forward from previous milestone close: ## Session Continuity -Last session: 2026-05-15T15:53:12.593Z -Stopped at: Completed Plan 01-04 — port keepalive + OFFSCREEN_READY handshake GREEN (9/9 tests pass); Plan 05 next (SW shrink + onConnect host with T-1-04 sender check) +Last session: 2026-05-15T16:06:29.412Z +Stopped at: Completed Plan 01-05 — SW shrink + onConnect host wired (T-1-04 sender check, OFFSCREEN_READY handshake, port-based buffer fetch, IDB orphan cleanup, hasDocument re-sync); 9/9 tests still green; Plan 06 next (vite.config.ts collapse) intel synthesis. Coverage validated: 11/11 v1 REQs mapped. -Resume file: .planning/phases/01-stabilize-video-pipeline/01-05-PLAN.md +Resume file: .planning/phases/01-stabilize-video-pipeline/01-06-PLAN.md diff --git a/.planning/phases/01-stabilize-video-pipeline/01-05-SUMMARY.md b/.planning/phases/01-stabilize-video-pipeline/01-05-SUMMARY.md new file mode 100644 index 0000000..dd81702 --- /dev/null +++ b/.planning/phases/01-stabilize-video-pipeline/01-05-SUMMARY.md @@ -0,0 +1,301 @@ +--- +phase: 01-stabilize-video-pipeline +plan: 05 +subsystem: service-worker-coordinator +tags: [chrome-extension, mv3, service-worker, long-lived-port, offscreen-document, t-1-04, security-mitigation] + +# Dependency graph +requires: + - phase: 01-stabilize-video-pipeline + provides: "Plan 03 ring-buffer ownership moved to offscreen; Plan 03 inline SW cleanup of VIDEO_CHUNK / VIDEO_CHUNK_SAVED / openIndexedDB / loadChunkFromIndexedDB; Plan 04 offscreen-side port keepalive + OFFSCREEN_READY handshake" +provides: + - "Shrunk src/background/index.ts (coordinator only): offscreen lifecycle, port host, export-time buffer fetch — zero local buffer state" + - "SW-side chrome.runtime.onConnect listener bound to 'video-keepalive' port (Plan 04 counterparty) with T-1-04 sender-id check" + - "Async getVideoBufferFromOffscreen(): REQUEST_BUFFER → BUFFER round-trip with 2s timeout; powers GET_VIDEO_BUFFER and SAVE_ARCHIVE handlers" + - "OFFSCREEN_READY handshake handler resolving a module-level Promise; startVideoCapture awaits it before sending START_RECORDING (audit P1 #12 fix)" + - "Idempotent indexedDB.deleteDatabase('VideoRecorderDB') in onInstalled (T-1-NEW-05-02; RESEARCH.md Runtime State Inventory)" + - "chrome.offscreen.hasDocument() check on SW init for robust offscreenCreated state across SW respawns (audit P1 #8)" + - "T-1-NEW-05-01 onMessage sender.id guard at handler top" +affects: [01-06-vite-config, 01-07-ffprobe-gate] + +# Tech tracking +tech-stack: + added: [] + patterns: + - "SW-as-pure-coordinator: zero local state for chunks; offscreen is the single source of truth (D-16)" + - "Promise-based handshake (offscreenReady) so popup's transient user-activation isn't lost to bootstrap race" + - "Port-based async RPC via REQUEST_BUFFER → BUFFER with per-call onMessage listener + 2 s timeout fallback" + - "Defense-in-depth on both onConnect (port name + port.sender?.id) and onMessage (sender.id) — T-1-04 mitigations on both surfaces" + - "instanceof Error pattern in catches instead of '(error as any).message' — eliminates audit P1 #13 instances in this file" + +key-files: + created: [] + modified: + - "src/background/index.ts (388 → 491 lines; ~ +130 / -100 net; structural shrink — buffer + alarms + IDB + tabCapture paths went away; port host + handshake + IDB cleanup + hasDocument check + sender guards came in)" + +key-decisions: + - "checkPermissions / requestPermissions deleted entirely (Rule 1 deviation): they referenced 'tabCapture' permission which was swapped to 'desktopCapture' in manifest (D-A6). Under getDisplayMedia (D-01) no runtime-permission check is meaningful — the browser prompts via picker on user gesture. REQUEST_PERMISSIONS now just calls startVideoCapture() and returns granted:true. Plan only mandated removing the getMediaStreamId call; the broken permissions code was logically downstream." + - "Synchronous getVideoBuffer() kept as an empty-array stub in Task 1 (to keep tsc clean while videoBuffer module state was deleted), then replaced with async getVideoBufferFromOffscreen() in Task 2. The plan acknowledges this two-step in Task 2 step (4)." + - "Added chrome.offscreen.hasDocument() check inside initialize() (Rule 2 robustness — orchestrator-flagged audit P1 #8). The check is guarded with `typeof chrome.offscreen?.hasDocument === 'function'` so it stays safe across versions and partial stubs. Plan did not explicitly require this, but the orchestrator's instructions did." + - "Fixed two `as any` casts in the existing code that the plan didn't strictly require but CLAUDE.md mandates: (a) the catch block in ensureOffscreen now uses `error instanceof Error` instead of `(error as any).message`; (b) chrome.tabs.sendMessage cast moved from `as any` to an explicit `{ events?, userEvents? } | undefined` type. Both are pre-existing audit P1 #13 instances; cleaning them now closes a deviation surface for Phase 5." + - "Did NOT mark REQ-video-ring-buffer complete: Plan 07 owns the ffprobe gate that proves end-to-end requirement satisfaction." + +patterns-established: + - "Port lifecycle on SW side: onConnect → port-name filter → sender.id filter → store in videoPort → register onDisconnect (null out reference) → done. Each request installs a one-shot onMessage listener via getVideoBufferFromOffscreen and removes it on completion or timeout." + - "Handshake pattern: module-level Promise + resolve closure captured at module load. OFFSCREEN_READY case calls resolve() and nulls out the closure (one-shot semantics). startVideoCapture awaits it after ensureOffscreen()." + - "T-1-04 enforcement: when SW is the trusting party of a port opened by offscreen, validate `port.sender?.id === chrome.runtime.id`. When SW is the trusting party of a runtime message, validate `sender.id === chrome.runtime.id`. Both checks are now in place." + +requirements-completed: [] # REQ-video-ring-buffer still pending Plan 07 ffprobe gate; this plan is structural plumbing only. + +# Metrics +duration: 8min +completed: 2026-05-15 +--- + +# Phase 01 Plan 05: SW Shrink + Port Host Summary + +**Shrunk `src/background/index.ts` to a pure coordinator: deleted legacy buffer / alarms / IndexedDB / tabCapture code paths (Task 1) and wired the SW-side counterparty of the long-lived `'video-keepalive'` port (Task 2) — with T-1-04 sender-id guards on both onConnect and onMessage, an `OFFSCREEN_READY` handshake, `chrome.offscreen.hasDocument()` re-sync on SW respawn, and an idempotent `indexedDB.deleteDatabase('VideoRecorderDB')` cleanup on install.** + +## Performance + +- **Duration:** ~8 min +- **Started:** 2026-05-15T15:53:30Z (immediately after Plan 04 completed) +- **Completed:** 2026-05-15T16:03:00Z +- **Tasks:** 2 (DELETE pass + ADD pass) +- **Commits:** 2 (one per task) +- **Files modified:** 1 (`src/background/index.ts`) + +## Before / After Line Count + +| Snapshot | Lines | Notes | +|----------|-------|-------| +| Pre-Plan 05 (post-Plan 03 inline cleanup) | **436** | Plan 03's executor had already removed VIDEO_CHUNK / VIDEO_CHUNK_SAVED / openIndexedDB / loadChunkFromIndexedDB inline as Rule-3 blocking-fix deps. | +| Post-Task 1 (DELETE pass) | 387 | -49 lines: deletions of videoBuffer, setupKeepalive, chrome.tabCapture.getMediaStreamId, checkPermissions, requestPermissions, USER_MEDIA cast, two `as any` casts. | +| Post-Task 2 (ADD pass) | **491** | +104 lines: onConnect handler, getVideoBufferFromOffscreen, offscreenReady Promise, OFFSCREEN_READY case, sender-id guards, indexedDB.deleteDatabase, hasDocument check, comments documenting each mitigation. | + +The plan estimated 380-440 lines post-Task 2. The actual count is 491 because (a) I added the orchestrator-requested `chrome.offscreen.hasDocument()` block (~15 lines including comments) and (b) I expanded the comments around each security mitigation to make T-1-04 / T-1-NEW-05-01 / T-1-NEW-05-02 / audit P1 #8 / audit P1 #12 references explicit for future auditors. The structural shrink (zero buffer state, zero alarms, zero IDB plumbing, zero tabCapture) is intact — the line-count overshoot is documentation, not code. + +## Task 1: Deletions + +**Commit:** `886376e refactor(01-05): delete legacy SW buffer, alarms, IndexedDB, tabCapture paths` + +| Deleted Symbol / Path | Reason | +|-----------------------|--------| +| `let videoBuffer: VideoChunk[] = []` | D-16 — buffer ownership moved to offscreen | +| `function setupKeepalive` + `chrome.alarms.create('keepalive', ...)` + `chrome.alarms.onAlarm.addListener` | D-18 / audit P1 #8 — alarms never reset SW idle timer; port does | +| Call site `setupKeepalive()` inside `initialize` | Paired with the function delete | +| `chrome.tabCapture.getMediaStreamId({...})` block inside `startVideoCapture` (and its `as any` cast) | D-01 — getDisplayMedia now runs inside the offscreen document | +| `async function checkPermissions` | Referenced `'tabCapture'` (removed from manifest by D-A6); under getDisplayMedia no runtime perm check is meaningful | +| `async function requestPermissions` | Same reason. The popup user-gesture flows directly into startVideoCapture now | +| `reasons: ['USER_MEDIA'] as any` in createDocument | Replaced by canonical `[chrome.offscreen.Reason.DISPLAY_MEDIA]` (D-02; @types/chrome 0.0.268 exposes the enum) | +| `(error as any).message?.includes(...)` in createDocument catch | Replaced by `error instanceof Error ? error.message : String(error)` (CLAUDE.md no-`as any` rule) | +| `as any` cast on `chrome.tabs.sendMessage(...)` response | Replaced by an explicit `{ events?: unknown[]; userEvents?: unknown[] } | undefined` type | +| Justification string `'Need to record video from tab for error reporting'` | Replaced with `'Continuous screen recording for operator session diagnostics'` to match the new capture semantics (D-04 — NOT silent) | + +**Note (already done by Plan 03):** `addVideoChunkFromBlob`, `cleanupVideoBuffer`, `firstChunkSaved`, `VIDEO_BUFFER_DURATION_MS`, the `VIDEO_CHUNK` and `VIDEO_CHUNK_SAVED` case branches, `loadChunkFromIndexedDB`, `openIndexedDB`, and the chrome.tabs.onActivated handler were ALREADY removed by Plan 03's Rule-3 inline cleanup (logged in STATE.md decisions). Plan 05 verified these via grep gates and removed only the residual placeholder comments. + +## Task 2: Additions + +**Commit:** `5cd1519 feat(01-05): wire SW-side port host and port-based buffer fetch` + +### onMessage switch — final shape + +```typescript +chrome.runtime.onMessage.addListener((message: Message, sender, sendResponse) => { + // T-1-NEW-05-01 mitigation: only accept onMessage traffic from this extension + if (sender.id !== chrome.runtime.id) { + logger.warn('Rejecting message with mismatched sender:', sender.id); + return false; + } + logger.log('Received message:', message.type, message); + + switch (message.type) { + case 'REQUEST_PERMISSIONS': // → startVideoCapture(), respond {granted: true|false} + case 'GET_VIDEO_BUFFER': // → getVideoBufferFromOffscreen() → sendResponse(resp) + case 'SAVE_ARCHIVE': // → saveArchive() → sendResponse(result) + case 'OFFSCREEN_READY': // → offscreenReadyResolve?.(); offscreenReadyResolve = null + default: // → logger.warn('Unknown message type:', ...), return false + } +}); +``` + +### chrome.offscreen.createDocument — as committed + +```typescript +await chrome.offscreen.createDocument({ + url: url, + reasons: [chrome.offscreen.Reason.DISPLAY_MEDIA], + justification: 'Continuous screen recording for operator session diagnostics' +}); +``` + +(Plans 06 / 07 can grep against `chrome.offscreen.Reason.DISPLAY_MEDIA` to confirm D-02 wiring.) + +### onConnect — port host + +```typescript +chrome.runtime.onConnect.addListener((port) => { + if (port.name !== 'video-keepalive') return; + if (port.sender?.id !== chrome.runtime.id) { // T-1-04 + port.disconnect(); + return; + } + videoPort = port; + port.onDisconnect.addListener(() => { videoPort = null; }); +}); +``` + +### getVideoBufferFromOffscreen — port-based RPC + +```typescript +async function getVideoBufferFromOffscreen(): Promise { + if (videoPort === null) return { chunks: [] }; + const port = videoPort; + return new Promise((resolve) => { + const timer = setTimeout(() => { + port.onMessage.removeListener(handler); + resolve({ chunks: [] }); // 2 s timeout fallback + }, BUFFER_FETCH_TIMEOUT_MS); + const handler = (msg: unknown) => { + if (typeof msg === 'object' && msg !== null && (msg as { type?: unknown }).type === 'BUFFER') { + clearTimeout(timer); + port.onMessage.removeListener(handler); + const chunks = (msg as { chunks?: VideoChunk[] }).chunks ?? []; + resolve({ chunks }); + } + }; + port.onMessage.addListener(handler); + port.postMessage({ type: 'REQUEST_BUFFER' }); + }); +} +``` + +### onInstalled — orphan IDB cleanup + +```typescript +chrome.runtime.onInstalled.addListener((details) => { + // T-1-NEW-05-02 / RESEARCH.md Runtime State Inventory + try { + indexedDB.deleteDatabase('VideoRecorderDB'); + } catch (e) { + logger.warn('IDB cleanup failed:', e); + } + initialize(); +}); +``` + +### initialize() — hasDocument re-sync (P1 #8) + +```typescript +async function initialize() { + // After SW respawn, offscreenCreated resets to false but the offscreen + // document may still exist. Ask Chrome the ground truth. + try { + if (typeof chrome.offscreen?.hasDocument === 'function') { + const exists = await chrome.offscreen.hasDocument(); + if (exists) offscreenCreated = true; + } + } catch (err) { logger.warn(...); } +} +``` + +## Verification + +### tsc + vitest (both green) + +``` +$ npx tsc --noEmit +(exit 0, no output) + +$ npx vitest run + Test Files 4 passed (4) + Tests 9 passed (9) + Start at 18:03:02 + Duration 319ms +``` + +All 9 tests passing across 4 files in `tests/offscreen/` — Plan 04's offscreen-side stayed untouched, so port + handshake + ring-buffer + codec-check tests all green as expected. + +### Grep gates (all pass) + +| Gate | Expected | Actual | +|------|----------|--------| +| `chrome.alarms` in src/background/ | 0 | 0 | +| `VideoRecorderDB` / `openIndexedDB` / `loadChunkFromIndexedDB` in src/ (excluding cleanup call) | 0 outside cleanup | 2 (both the cleanup call + its log message) — only the cleanup path remains | +| `setupKeepalive` / `addVideoChunkFromBlob` / `cleanupVideoBuffer` / `tabCapture` / `getMediaStreamId` in src/background/ | 0 | 0 | +| `chrome.tabs.onActivated` / `chrome.tabs.onUpdated` in src/background/ | 0 | 0 (D-14 / D-15 satisfied) | +| `chrome.runtime.onConnect.addListener` in src/background/index.ts | 1 | 1 | +| `'video-keepalive'` in src/background/index.ts | ≥1 | 1 | +| `port.sender?.id !== chrome.runtime.id` (T-1-04) | 1 | 1 | +| `sender.id !== chrome.runtime.id` (T-1-NEW-05-01) | 1 | 1 | +| `indexedDB.deleteDatabase('VideoRecorderDB')` | 1 | 1 | +| `chrome.offscreen.hasDocument` (audit P1 #8) | ≥1 | 1 (the typeof + call) | +| `function getVideoBufferFromOffscreen` | 1 | 1 | +| `OFFSCREEN_READY` mentions | ≥1 | 3 (Promise comment + case label + log message) | +| `offscreenReady` mentions | ≥2 | 6 (Promise var + resolve closure + await + case label + log + comment) | +| `as any` in src/background/ | 0 | 0 | +| `@ts-ignore` in src/background/ | 0 | 0 | + +## Deviations from Plan + +### Rule 1 — Bug fixes (auto-applied) + +**1. [Rule 1 - Bug] Deleted broken `checkPermissions` / `requestPermissions` flow** +- **Found during:** Task 1. +- **Issue:** `chrome.permissions.contains({ permissions: ['tabCapture'] })` references a permission that was removed from `manifest.json` by D-A6 (replaced with `desktopCapture`). The check would always return `false`, sending `REQUEST_PERMISSIONS` into the never-granted branch, which itself calls `chrome.permissions.request({ permissions: ['tabCapture'] })` — same problem. Recording could not start cleanly. +- **Fix:** Deleted both functions entirely. `REQUEST_PERMISSIONS` now just calls `startVideoCapture()` (which goes through ensureOffscreen → DISPLAY_MEDIA reason → offscreen → getDisplayMedia picker → user gesture). +- **Files modified:** `src/background/index.ts`. +- **Commit:** `886376e`. + +**2. [Rule 1 - Bug] Replaced two `(error as any).message` patterns with `error instanceof Error`** +- **Found during:** Task 1 (the `as any` grep gate was at 2 instead of 0 because of a pre-existing instance in the ensureOffscreen catch). +- **Issue:** Audit P1 #13 — `as any` violates CLAUDE.md "no `as any`" rule. The catch block in `ensureOffscreen` accessed `.message` via `(error as any).message`. +- **Fix:** `const msg = error instanceof Error ? error.message : String(error); if (msg.includes(...)) { ... }`. +- **Files modified:** `src/background/index.ts`. +- **Commit:** `886376e`. + +**3. [Rule 1 - Bug] Replaced `chrome.tabs.sendMessage(...) as any` with an explicit response type** +- **Found during:** Task 1 (same `as any` grep gate). +- **Issue:** Same audit P1 #13 / CLAUDE.md violation; the response was typed as `any` to access `.events` and `.userEvents`. +- **Fix:** Explicit `{ events?: unknown[]; userEvents?: unknown[] } | undefined` annotation on the response variable; nullish coalescing for the two extracts. +- **Files modified:** `src/background/index.ts`. +- **Commit:** `886376e`. + +### Rule 2 — Missing critical functionality (auto-applied) + +**4. [Rule 2 - Robustness] Added `chrome.offscreen.hasDocument()` check inside `initialize()`** +- **Found during:** Task 2 (orchestrator-flagged audit P1 #8). +- **Issue:** Across SW respawns, the in-memory `offscreenCreated` flag resets to `false`, but the offscreen document may still be alive (it survives SW idle unload because it holds the DISPLAY_MEDIA-reason capture). The next `ensureOffscreen()` would then call `createDocument` over an existing one. The catch block handles "already exists" so it's not strictly broken — but the hasDocument check makes it idempotent and is the canonical Chrome MV3 pattern (RESEARCH.md A7). +- **Fix:** `initialize()` is now `async` and calls `await chrome.offscreen.hasDocument()` to set `offscreenCreated = true` if a document is already there. Guarded with `typeof chrome.offscreen?.hasDocument === 'function'` so it stays safe across @types/chrome versions and partial stubs. +- **Files modified:** `src/background/index.ts`. +- **Commit:** `5cd1519`. + +### Plan / orchestrator reconciliation note + +The plan's `must_haves` and Task 1 instructions referenced symbols (`addVideoChunkFromBlob`, `cleanupVideoBuffer`, IDB helpers, VIDEO_CHUNK case, etc.) that Plan 03's executor had already inline-deleted as a Rule-3 blocking-fix dependency (documented in STATE.md). Plan 05 verified those via grep gates and only had to handle the residual `videoBuffer` array, the keepalive function, the tabCapture call site, and the comments. This matches the orchestrator's pre-flight note in the prompt. + +## TDD Gate Compliance + +This plan was `type: execute` (not `type: tdd`), so the RED/GREEN/REFACTOR gate sequence does not apply. The test suite remained at 9/9 throughout — Plan 04's port + handshake tests stayed green because Plan 05 only touches the SW side, and the offscreen-side port contract is unchanged. + +## Authentication Gates + +None — this plan is pure refactor + integration plumbing. + +## Known Stubs + +None. All paths in the modified file have a real implementation. `getVideoBufferFromOffscreen` returns `{ chunks: [] }` when `videoPort === null`, which is an intentional fallback (offscreen not yet connected, e.g. during SW cold start before the offscreen has finished bootstrapping). This is the documented contract per `` step 4 of the plan, not a stub. + +## Self-Check + +Verified after writing this summary: +- ✓ `886376e` exists in git log (Task 1 commit). +- ✓ `5cd1519` exists in git log (Task 2 commit). +- ✓ `src/background/index.ts` exists (491 lines). +- ✓ `npx tsc --noEmit` exits 0. +- ✓ `npx vitest run` reports 9/9 PASS across 4 test files. +- ✓ All Task 1 deletion grep gates return 0. +- ✓ All Task 2 addition grep gates return their expected counts. +- ✓ `grep -c "as any"` and `grep -c "@ts-ignore"` in `src/background/` both return 0. + +## Self-Check: PASSED