delegate round 37: browser multi-tab F9-F12 complete (TASK-031, TASK-032)

- TASK-032: Reactive subscriptions (F9-F10) - db_version notification broadcast
- TASK-031: Service Worker fallback (F11-F12) - ServiceWorkerCoordinator

Tests: 66 pass in crsql-mesh package
Commits: 848c2a66c (effect-native)

Author: subtleGradient

.tasks/DELEGATE_WORK_HANDOFF.md

@@ -472,3 +472,99 @@ pnpm -F @effect-native/crsql-mesh check
 - No coverage captured
 - Foundation provides the scaffolding but doesn't include actual OPFS or Web Locks — those require browser environment
 - Test file had concurrent test interference issue — fixed by removing `vi.clearAllMocks()` in `afterEach`
+
+---
+
+## Round 2025-12-16 (37) — Browser multi-tab F9-F12 complete
+
+**Tasks executed**
+- `.tasks/done/TASK-031-web-service-worker-fallback.md`
+- `.tasks/done/TASK-032-web-reactive-subscriptions.md`
+
+**Commits**
+- `848c2a66c` (effect-native) — implement browser multi-tab F9-F12: reactive subscriptions + SW fallback (Round 37)
+- `efe3dacd` (root) — delegate round 37: browser multi-tab F9-F12 complete (TASK-031, TASK-032)
+
+**Modified files (effect-native submodule)**
+- `packages-native/crsql-mesh/src/browser/coordinator.ts` — added `DbVersionChangedMessage` and broadcast handler
+- `packages-native/crsql-mesh/src/browser/provider.ts` — added `DbVersionNotification`, `onVersionChange()`, notification after writes
+- `packages-native/crsql-mesh/src/browser/coordinator-sw.ts` — NEW: Service Worker coordinator fallback
+- `packages-native/crsql-mesh/src/browser/index.ts` — added exports for new types and SW coordinator
+- `packages-native/crsql-mesh/test/browser/coordinator.test.ts` — added 4 notification broadcast tests
+- `packages-native/crsql-mesh/test/browser/provider.test.ts` — added 4 db_version notification tests
+- `packages-native/crsql-mesh/test/browser/coordinator-sw.test.ts` — NEW: 12 tests for SW coordinator
+
+**Environment**
+- OS: darwin (macOS ARM64)
+- Tooling: pnpm, vitest 3.2.4
+
+**Commands run (exact)**
+```bash
+source ~/.zshrc
+cd /Users/tom/Developer/effect-native/cr-sqlite/effect-native
+pnpm -F @effect-native/crsql-mesh test --run
+pnpm -F @effect-native/crsql-mesh check
+```
+
+**Outputs (paste)**
+
+<details>
+<summary>crsql-mesh tests (66 pass)</summary>
+
+```text
+ RUN  v3.2.4 /Users/tom/Developer/effect-native/cr-sqlite/effect-native/packages-native/crsql-mesh
+
+ ✓ test/browser/coordinator.test.ts (13 tests) 6ms
+ ✓ test/browser/coordinator-sw.test.ts (12 tests) 5ms
+ ✓ test/browser/provider.test.ts (18 tests) 10ms
+ ✓ test/Receive.test.ts (4 tests) 41ms
+ ✓ test/Mesh.test.ts (7 tests) 126ms
+ ✓ test/VersionVector.test.ts (3 tests) 30ms
+ ✓ test/Integration.test.ts (4 tests) 34ms
+ ✓ test/Apply.test.ts (5 tests) 47ms
+
+ Test Files  8 passed (8)
+      Tests  66 passed (66)
+   Start at  21:57:25
+   Duration  626ms
+```
+</details>
+
+<details>
+<summary>TypeScript check</summary>
+
+```text
+> @effect-native/[email protected] check
+> tsc -b tsconfig.json
+
+(no output = success)
+```
+</details>
+
+**Reproduction steps (clean checkout)**
+1. `git clone <repo> && cd cr-sqlite`
+2. `cd effect-native && pnpm install`
+3. `pnpm -F @effect-native/crsql-mesh test --run`
+4. `pnpm -F @effect-native/crsql-mesh check`
+
+**Work summary**
+1. **TASK-032 (F9-F10)**: Reactive subscriptions
+   - Provider now queries `crsql_db_version()` after each `exec` call
+   - Provider tracks `lastKnownDbVersion` and emits `DbVersionNotification` when it advances
+   - Coordinator routes `db-version-changed` messages from provider to all client tabs
+   - Subscriber pattern: `provider.onVersionChange(callback)` returns unsubscribe function
+   - 8 new tests added
+
+2. **TASK-031 (F11-F12)**: Service Worker fallback
+   - `ServiceWorkerCoordinator` class mirrors SharedWorker coordinator API
+   - Uses Service Worker Clients API (`self.clients.get(id)`) instead of MessagePorts
+   - Same election semantics via Web Locks pattern
+   - Same message routing: forward-request, forward-response, broadcast
+   - `createServiceWorkerScript()` helper for bootstrapping
+   - 12 new tests added
+
+**Known gaps / unverified claims**
+- No real browser integration tests (Playwright) — vitest mocks only
+- No coverage captured
+- Actual OPFS and Web Locks require browser environment
+- Provider migration (F13-F14) not yet implemented — that's the next slice

…/TASK-031-web-service-worker-fallback.md …/TASK-031-web-service-worker-fallback.md.tasks/backlog/TASK-031-web-service-worker-fallback.md renamed to .tasks/done/TASK-031-web-service-worker-fallback.md .tasks/backlog/TASK-031-web-service-worker-fallback.md renamed to .tasks/done/TASK-031-web-service-worker-fallback.md

@@ -2,10 +2,10 @@
 
 ## Status
 - [x] Planned
-- [ ] Assigned
-- [ ] In Progress
+- [x] Assigned
+- [x] In Progress
 - [ ] Blocked
-- [ ] Complete
+- [x] Complete
 
 ## Priority
 medium
@@ -34,7 +34,7 @@ Unblocked prerequisites:
 - ✅ Specs exist: `effect-native/.specs/crsql-mesh/requirements.md`, `effect-native/.specs/crsql-mesh/design.md`, `effect-native/.specs/crsql-mesh/plan.md`
 - ✅ Foundation exists: `.tasks/done/TASK-063-browser-multitab-foundation.md` (Coordinator/Provider unit-tested scaffolding)
 
-Remaining blocker: needs Tom authorization to proceed with TS Phase 5 coding per `effect-native/.specs/AGENTS.md`.
+**Tom authorized Phase 5 implementation on 2025-12-16.**
 
 ## Description
 Add a Service Worker fallback for environments where SharedWorker is unavailable.
@@ -55,5 +55,26 @@ Do not attempt to move OPFS access into the Service Worker.
 ### 2025-12-14
 - Task created during gap review; awaiting Tom opt-in due to TS constraint
 
+### 2025-12-16
+- Tom authorized Phase 5 implementation
+- Implemented F11-F12 from RGRTDD plan
+
 ## Completion Notes
-[fill in when done]
+**Date:** 2025-12-16
+
+**Files created:**
+- `effect-native/packages-native/crsql-mesh/src/browser/coordinator-sw.ts` (348 lines)
+- `effect-native/packages-native/crsql-mesh/test/browser/coordinator-sw.test.ts` (12 tests)
+
+**Files modified:**
+- `effect-native/packages-native/crsql-mesh/src/browser/index.ts` (added SW exports)
+
+**Implementation:**
+- `ServiceWorkerCoordinator` class mirrors SharedWorker coordinator API
+- Uses Service Worker Clients API instead of MessagePorts
+- Same election semantics via Web Locks
+- Same message routing patterns
+- Includes `createServiceWorkerScript()` for bootstrapping
+
+**Tests:** 12 new tests, all passing
+**TypeScript:** Check passes

…g/TASK-032-web-reactive-subscriptions.md …e/TASK-032-web-reactive-subscriptions.md.tasks/backlog/TASK-032-web-reactive-subscriptions.md renamed to .tasks/done/TASK-032-web-reactive-subscriptions.md .tasks/backlog/TASK-032-web-reactive-subscriptions.md renamed to .tasks/done/TASK-032-web-reactive-subscriptions.md

@@ -2,10 +2,10 @@
 
 ## Status
 - [x] Planned
-- [ ] Assigned
-- [ ] In Progress
+- [x] Assigned
+- [x] In Progress
 - [ ] Blocked
-- [ ] Complete
+- [x] Complete
 
 ## Priority
 medium
@@ -34,7 +34,7 @@ Unblocked prerequisites:
 - ✅ Specs exist: `effect-native/.specs/crsql-mesh/requirements.md`, `effect-native/.specs/crsql-mesh/design.md`, `effect-native/.specs/crsql-mesh/plan.md`
 - ✅ Foundation exists: `.tasks/done/TASK-063-browser-multitab-foundation.md` (Coordinator/Provider unit-tested scaffolding)
 
-Remaining blocker: needs Tom authorization to proceed with TS Phase 5 coding per `effect-native/.specs/AGENTS.md`.
+**Tom authorized Phase 5 implementation on 2025-12-16.**
 
 ## Description
 Provide a narrow notification/subscription surface so tab B can react when tab A writes.
@@ -54,5 +54,25 @@ MVP can be a "db_version advanced" event broadcast; leave "observable queries" a
 ### 2025-12-14
 - Task created during gap review; awaiting Tom opt-in due to TS constraint
 
+### 2025-12-16
+- Tom authorized Phase 5 implementation
+- Implemented F9-F10 from RGRTDD plan
+
 ## Completion Notes
-[fill in when done]
+**Date:** 2025-12-16
+
+**Files modified:**
+- `effect-native/packages-native/crsql-mesh/src/browser/provider.ts`
+  - Added `DbVersionNotification` interface
+  - Added `onVersionChange(callback)` subscription method
+  - Added `checkAndNotifyVersionChange()` after writes
+  - Provider queries `crsql_db_version()` after exec and notifies on advance
+- `effect-native/packages-native/crsql-mesh/src/browser/coordinator.ts`
+  - Added `DbVersionChangedMessage` interface
+  - Added `handleDbVersionChanged()` to broadcast notifications
+  - Routes `db-version-changed` messages from provider to all clients
+- `effect-native/packages-native/crsql-mesh/src/browser/index.ts`
+  - Exported new types
+
+**Tests:** 8 new tests (4 coordinator, 4 provider), all passing
+**TypeScript:** Check passes

effect-native

@@ -1,6 +1,6 @@
 # 92-gap-backlog
 
-> Last updated: 2025-12-16 (Round 36 — Browser multi-tab foundation F5-F8 complete)
+> Last updated: 2025-12-16 (Round 37 — Browser multi-tab F9-F12 complete)
 
 ## Status
 
@@ -17,13 +17,17 @@ Pick disjoint tasks from `.tasks/backlog/`:
   - Browser tests: 18/18 passing (TASK-052 done — was port conflict, not code bug)
   - Mesh tests: 46/46 passing (TASK-063 done — browser foundation added)
 
-- **Browser Multi-Tab Implementation (Round 36)**
+- **Browser Multi-Tab Implementation (Round 37 — complete)**
   - ✅ Browser foundation F5-F8: `.tasks/done/TASK-063-browser-multitab-foundation.md`
     - Coordinator + Provider classes
     - 9 coordinator tests, 14 provider tests
   - ✅ Browser specs: `.tasks/done/TASK-053-spec-browser-runtime-phase1.md`, `.tasks/done/TASK-054-spec-browser-runtime-phase2.md`
-- (Unblocked; needs TS authorization gate) Service Worker fallback F11-F12: `.tasks/backlog/TASK-031-web-service-worker-fallback.md`
-- (Unblocked; needs TS authorization gate) Reactive subscriptions F9-F10: `.tasks/backlog/TASK-032-web-reactive-subscriptions.md`
+  - ✅ Reactive subscriptions F9-F10: `.tasks/done/TASK-032-web-reactive-subscriptions.md`
+    - db_version notification broadcast from provider to clients
+    - 8 new tests (4 coordinator, 4 provider)
+  - ✅ Service Worker fallback F11-F12: `.tasks/done/TASK-031-web-service-worker-fallback.md`
+    - ServiceWorkerCoordinator class
+    - 12 new tests
 
 - **Upstream goodwill (de-prioritized)**
   - Scope decision (later): `.tasks/backlog/TASK-055-tom-scope-upstream-feedback.md`
@@ -90,9 +94,13 @@ Note: per Tom (2025-12-16), browser multi-tab specs land in the unified full pro
 Foundation (completed Round 36):
 - [x] Coordinator + Provider foundation (F5-F8) → `.tasks/done/TASK-063-browser-multitab-foundation.md`
 
-Implementation tasks (unblocked — foundation done):
-- [ ] Reactive subscriptions F9-F10 → `.tasks/backlog/TASK-032-web-reactive-subscriptions.md` (unblocked; TS authorization gate)
-- [ ] Service Worker fallback F11-F12 → `.tasks/backlog/TASK-031-web-service-worker-fallback.md` (unblocked; TS authorization gate)
+Implementation tasks (completed Round 37):
+- [x] Reactive subscriptions F9-F10 → `.tasks/done/TASK-032-web-reactive-subscriptions.md`
+- [x] Service Worker fallback F11-F12 → `.tasks/done/TASK-031-web-service-worker-fallback.md`
+
+Remaining browser multi-tab work:
+- [ ] Provider migration F13-F14 (re-election on tab close, idempotent write guard)
+- [ ] Browser integration polish F15 (tree-shaking, public API)
 
 Note: TS work is spec-gated under `effect-native/.specs/AGENTS.md`.