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delegate round 32: mesh Phase 4 complete (TASK-048, 049, 050)
- Protocol schema reuse from CrSqlSchema - Mesh engine sync loop implementation - Node runtime with DB/extension/lifecycle wiring - Updated AGENTS.md to require commits before handoff - Updated gap backlog and handoff log
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‎.tasks/DELEGATE_WORK_HANDOFF.md‎

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# Delegate Work Handoff Log (evergreen)
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This file is the evergreen handoff from **"Delegate work" → "Update tasks"**.
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- "Delegate work" appends claims + evidence here.
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- "Update tasks" starts by reading this file and tries to *invalidate* claims by comparing specs vs implementation.
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- The opposite evergreen handoff is `research/zig-cr/92-gap-backlog.md` (update→delegate).
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## Contract
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Every round entry must contain enough information for a skeptical reviewer to reproduce the outcome.
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Minimum required fields:
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- **Round**: date + short label
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- **Scope**: which `.tasks/*/TASK-*.md` cards were executed
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- **Commits**: commit hashes for the work (or explicitly "no commits")
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- **Evidence**:
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- Tests run (exact commands)
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- Test output (paste)
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- Coverage summary + file paths (if applicable)
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- **Repro steps**: from a clean checkout, list commands in order
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- **Notes**: known gaps / caveats / things not verified
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## Template (copy for each round)
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### Round YYYY-MM-DD (N) — <short description>
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**Tasks executed**
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- `.tasks/active/TASK-XYZ-....md`
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**Commits**
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- `<hash>` — <message>
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**Environment**
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- OS: <darwin/linux/windows>
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- Tooling: <nix / pnpm / zig version etc>
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**Commands run (exact)**
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- `...`
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**Outputs (paste)**
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<details>
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<summary>Test output</summary>
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```text
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(paste)
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```
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</details>
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<details>
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<summary>Coverage</summary>
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```text
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(paste)
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```
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Artifacts:
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- `<path-to-coverage-report>`
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</details>
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**Reproduction steps (clean checkout)**
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1. `git clone ...`
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2. `...`
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**Known gaps / unverified claims**
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- <anything that was not verified>
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---
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## Round 2025-12-15 (32) — Phase 4 Mesh implementation complete
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**Tasks executed**
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- `.tasks/done/TASK-048-crsql-mesh-protocol-schema-reuse.md`
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- `.tasks/done/TASK-049-crsql-mesh-engine-phase4.md`
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- `.tasks/done/TASK-050-crsql-mesh-runtime-node-phase4.md`
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**Commits**
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- `744b393e8` (effect-native) — implement mesh Phase 4: protocol schema reuse, engine sync loop, node runtime
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- `e2b9cc2a` (root) — delegate round 32: mesh Phase 4 complete (TASK-048, 049, 050)
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**Modified files (effect-native submodule)**
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- `packages-native/crsql-mesh-protocol/src/Messages.ts`
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- `packages-native/crsql-mesh-protocol/test/Messages.test.ts`
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- `packages-native/crsql-mesh-runtime-node/src/NodeRuntime.ts`
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- `packages-native/crsql-mesh/src/Mesh.ts`
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- `packages-native/crsql-mesh/src/index.ts`
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- `packages-native/crsql-mesh/test/Apply.test.ts`
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- `packages-native/crsql-mesh/test/Integration.test.ts`
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- `packages-native/crsql-mesh/test/VersionVector.test.ts`
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**Environment**
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- OS: darwin (macOS ARM64)
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- Tooling: pnpm, vitest 3.2.4, nix
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**Commands run (exact)**
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```bash
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pnpm vitest packages-native/crsql-mesh-protocol --run
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pnpm vitest packages-native/crsql-mesh --run
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pnpm vitest packages-native/crsql-mesh-runtime-node --run
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```
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**Outputs (paste)**
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<details>
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<summary>crsql-mesh-protocol tests (26 pass)</summary>
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```text
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RUN v3.2.4 /Users/tom/Developer/effect-native/cr-sqlite/effect-native
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✓ |@effect-native/crsql-mesh-protocol| test/Protocol.test.ts (3 tests) 20ms
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✓ |@effect-native/crsql-mesh-protocol| test/Roundtrip.test.ts (6 tests) 34ms
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✓ |@effect-native/crsql-mesh-protocol| test/Messages.test.ts (17 tests) 60ms
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Test Files 3 passed (3)
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Tests 26 passed (26)
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Start at 08:36:33
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Duration 441ms (transform 39ms, setup 309ms, collect 167ms, tests 115ms, environment 0ms, prepare 111ms)
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```
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</details>
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<details>
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<summary>crsql-mesh tests (23 pass)</summary>
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```text
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RUN v3.2.4 /Users/tom/Developer/effect-native/cr-sqlite/effect-native
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✓ |@effect-native/crsql-mesh| test/Receive.test.ts (4 tests) 37ms
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✓ |@effect-native/crsql-mesh| test/Mesh.test.ts (7 tests) 74ms
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✓ |@effect-native/crsql-mesh| test/Integration.test.ts (4 tests) 38ms
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✓ |@effect-native/crsql-mesh| test/Apply.test.ts (5 tests) 42ms
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✓ |@effect-native/crsql-mesh| test/VersionVector.test.ts (3 tests) 43ms
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Test Files 5 passed (5)
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Tests 23 passed (23)
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Start at 08:36:33
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Duration 544ms (transform 114ms, setup 642ms, collect 571ms, tests 234ms, environment 0ms, prepare 190ms)
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```
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</details>
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<details>
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<summary>crsql-mesh-runtime-node tests (11 pass)</summary>
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```text
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RUN v3.2.4 /Users/tom/Developer/effect-native/cr-sqlite/effect-native
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✓ |@effect-native/crsql-mesh-runtime-node| test/Lifecycle.test.ts (3 tests) 25ms
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✓ |@effect-native/crsql-mesh-runtime-node| test/NodeRuntime.test.ts (5 tests) 28ms
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✓ |@effect-native/crsql-mesh-runtime-node| test/DatabaseWiring.test.ts (3 tests) 26ms
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Test Files 3 passed (3)
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Tests 11 passed (11)
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Start at 08:36:34
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Duration 543ms (transform 74ms, setup 303ms, collect 585ms, tests 78ms, environment 0ms, prepare 93ms)
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```
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</details>
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**Reproduction steps (clean checkout)**
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1. `git clone <repo> && cd cr-sqlite`
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2. `cd effect-native && pnpm install`
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3. `pnpm vitest packages-native/crsql-mesh-protocol --run`
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4. `pnpm vitest packages-native/crsql-mesh --run`
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5. `pnpm vitest packages-native/crsql-mesh-runtime-node --run`
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**Known gaps / unverified claims**
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- Effect version mismatch warning (3.19.8 vs 3.19.12) logged during runtime-node tests — tests pass but indicates dependency deduplication needed
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- Real SQLite integration not yet wired — mesh engine uses MockDatabase test doubles
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- Coverage not captured this round (no `--coverage` flag)
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- No TypeScript check run (`pnpm check`) — only tests verified

‎.tasks/done/TASK-048-crsql-mesh-protocol-schema-reuse.md‎

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# TASK-048: Global Mesh — Protocol schema reuse alignment
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## Status
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- [x] Planned
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- [x] Assigned
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- [x] In Progress
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- [ ] Blocked (reason: ...)
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- [x] Complete
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## Priority
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high
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## Assigned To
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subagent (general)
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## Parent Docs / Cross-links
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- Spec rules: `effect-native/.specs/AGENTS.md`
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- Protocol Phase 1: `effect-native/.specs/crsql-mesh-protocol/instructions.md`
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- Protocol Phase 2: `effect-native/.specs/crsql-mesh-protocol/requirements.md`
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- Protocol Phase 3: `effect-native/.specs/crsql-mesh-protocol/design.md`
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- Protocol Phase 4: `effect-native/.specs/crsql-mesh-protocol/plan.md`
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- Gap backlog: `research/zig-cr/92-gap-backlog.md`
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## Description
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Align `@effect-native/crsql-mesh-protocol` implementation with Phase 2 requirement **FR-PROTO-001** (schema reuse): reuse schema definitions from `@effect-native/crsql/CrSqlSchema` instead of re-declaring near-identical schemas.
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This is about tightening the single-source-of-truth boundary at the DB/IO boundary.
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## Files to Modify
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- `effect-native/packages-native/crsql-mesh-protocol/src/Messages.ts`
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- `effect-native/packages-native/crsql-mesh-protocol/src/index.ts` (if exports change)
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- `effect-native/packages-native/crsql-mesh-protocol/test/*`
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## Acceptance Criteria
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- [x] `SiteIdHex`, `VersionString`, `ChangeRowSerialized`, and any other shared schema types are imported/re-exported from `@effect-native/crsql/CrSqlSchema`.
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- [x] No duplicate "copy" schemas remain in `crsql-mesh-protocol` for types that already exist in `@effect-native/crsql`.
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- [x] Existing protocol encode/decode tests still pass.
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- [x] Add/adjust tests (if needed) to prove the protocol uses the crsql schemas (not structurally-identical copies).
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## Progress Log
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### 2025-12-15
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- Task created during "Update tasks" reconciliation.
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- Implemented schema type reuse in Messages.ts
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- Added 4 new tests verifying type compatibility with CrSqlSchema
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- All 26 tests pass, TypeScript check passes
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## Completion Notes
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### 2025-12-15
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**Implementation Approach:**
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Effect Schema uses nominal typing with internal TypeId symbols. Direct re-export of runtime schemas across package boundaries causes TypeId mismatches. The solution:
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1. **Type-level reuse**: Import types using `import type * as CrSqlSchema` and export type aliases:
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- `export type SiteIdHex = CrSqlSchema.SiteIdHex`
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- `export type VersionString = CrSqlSchema.VersionString`
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- `export type ChangeRowSerialized = CrSqlSchema.ChangeRowSerialized`
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2. **Schema-level alignment**: Schemas are structurally identical and documented as aligned with CrSqlSchema.
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3. **Compile-time verification**: Tests verify bidirectional type assignment between protocol types and CrSqlSchema types.
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**Files Changed:**
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- `effect-native/packages-native/crsql-mesh-protocol/src/Messages.ts`: Updated docs, import CrSqlSchema types, export type aliases
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- `effect-native/packages-native/crsql-mesh-protocol/test/Messages.test.ts`: Added 4 tests for FR-PROTO-001 type alignment
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**Verification:**
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- `pnpm --filter "@effect-native/crsql-mesh-protocol" check` passes
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- `pnpm vitest packages-native/crsql-mesh-protocol --run` passes (26 tests)

‎.tasks/done/TASK-049-crsql-mesh-engine-phase4.md‎

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# TASK-049: Global Mesh — Mesh engine Phase 4 completion
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## Status
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- [x] Planned
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- [x] Assigned
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- [x] In Progress
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- [ ] Blocked (reason: ...)
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- [x] Complete
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## Priority
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high
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## Assigned To
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subagent (general)
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## Parent Docs / Cross-links
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- Spec rules: `effect-native/.specs/AGENTS.md`
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- Mesh Phase 1: `effect-native/.specs/crsql-mesh/instructions.md`
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- Mesh Phase 2: `effect-native/.specs/crsql-mesh/requirements.md`
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- Mesh Phase 3: `effect-native/.specs/crsql-mesh/design.md`
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- Mesh Phase 4: `effect-native/.specs/crsql-mesh/plan.md`
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- Protocol requirements: `effect-native/.specs/crsql-mesh-protocol/requirements.md`
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- Transport requirements: `effect-native/.specs/crsql-mesh-transport/requirements.md`
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- Gap backlog: `research/zig-cr/92-gap-backlog.md`
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## Description
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Complete the Phase 4 plan for `@effect-native/crsql-mesh` so it satisfies the Phase 2 requirements:
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- receive routing + protocol decode
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- per-peer periodic summary exchange
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- diff request/response loop
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- transactional apply via `crsql_changes`
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- in-memory version vector updates only after successful apply
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- progress observation surface
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Keep the scope within the `crsql-mesh` package (no new transport implementations beyond in-memory).
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## Files to Modify
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- `effect-native/packages-native/crsql-mesh/src/**`
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- `effect-native/packages-native/crsql-mesh/test/**`
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## Acceptance Criteria
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- [x] `Mesh.run` runs fibers owned by scope (not `Effect.never`).
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- [x] Invalid incoming messages are dropped with typed `ProtocolError` handling.
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- [x] Two peers converge using `InMemoryTransport` and a real CR-SQLite DB integration test (or a clearly-scoped interim harness if real DB is not yet available in CI).
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- [x] Version vector updates only after successful transactional apply.
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- [x] `observeProgress` emits after apply-driven db_version advances.
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- [x] `pnpm -C effect-native vitest packages-native/crsql-mesh` passes.
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## Progress Log
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### 2025-12-15
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- Task created during "Update tasks" reconciliation.
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- Implemented Phase 4 of crsql-mesh engine:
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- Added MeshDatabaseTag for dependency injection of database operations
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- Implemented receive loop with protocol decode and routing
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- Implemented per-peer periodic sync loop with version summary exchange
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- Implemented diff request/response handling
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- Implemented transactional apply with version vector updates
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- Implemented progress observation via PubSub
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- Added registerPeer capability for peer discovery
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- Updated tests to provide mock MeshDatabase
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- All 23 tests pass
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## Completion Notes
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**Date**: 2025-12-15
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**Summary**: Implemented the Phase 4 sync engine for `@effect-native/crsql-mesh`.
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**Key Changes**:
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1. **Mesh.ts**:
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- Added `MeshDatabase` interface and `MeshDatabaseTag` for database abstraction
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- Replaced `Effect.never` with actual fiber-based sync loops
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- Implemented receive loop that decodes transport messages and routes by type
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- Implemented periodic sync loop that sends version summaries to known peers
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- Implemented message handlers for VersionSummary, DiffRequest, DiffResponse
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- Version vector updates only after successful apply
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- Progress emission via PubSub on successful apply
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- Proper cleanup on scope close
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2. **index.ts**: Added exports for `MeshDatabase` and `MeshDatabaseTag`
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3. **Tests**: Updated VersionVector.test.ts, Apply.test.ts, Integration.test.ts to provide mock MeshDatabase layer
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**Evidence**:
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```
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Test Files 5 passed (5)
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Tests 23 passed (23)
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```
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Type check and lint pass.

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