Verification — P0.7.2 ζ Thought CRUD

Task: P0.7.2 — ζ Decision Trail CRUD repository + MCP tools
Branch: feature/p0-7-2-thought-crud
Worktree: .worktrees/claude/p0-7-2-thought-crud
Date: 2026-04-17
Executor: Claude Sonnet 4.6 (T3)

1. Test count

Metric	Value
New tests added (this task)	48
Total suite count after merge	642
Trail repository test file	`src/__tests__/domains/trail/repository.test.ts`

New tests added cover: basic CRUD, all 4 thought types, hash-chain integrity, genesis invariant, determinism/pinned hash, cross-task isolation, list ordering/pagination, Zod schema validation, registerThoughtTools registration.

2. Coverage on `src/domains/trail/repository.ts`

Metric	Coverage
Statements	85.71%
Branches	90%
Functions	80%
Lines	85.1%

Uncovered: lines 377, 390–397 — the createThoughtRecord(getDb(), input) and filter-building closures inside registerThoughtTools tool handlers. These execute only when the tool is called through the live MCP SDK with a real initialized DB. They cannot be unit-tested without a full bootstrap cycle and are documented as a residual risk. The registration function itself (line 367) is fully covered by the registerThoughtTools test group.

3. Gate output

npm test (all suites)

Tests:       642 passed, 642 total
Test Suites: 12 passed, 12 total
Time:        16.517 s

npm run lint

> colibri@0.0.1 lint
> eslint src
(no output — zero warnings/errors)

npm run build (tsc)

(no output — zero type errors)

4. Hash-chain integrity proof

Test name: hash-chain integrity › chain of N=5: each record prev_hash links to predecessor hash (insertion order via deterministic IDs)

Outcome: PASS

Chain invariant verified: for records r[0]..r[4] in a single task_id:

r[0].prev_hash === ZERO_HASH (genesis sentinel)
r[i].prev_hash === r[i-1].hash for i ∈ {1,2,3,4}

Additional chain tests:

second record links to first record hash as prev_hash — PASS
third record links to second record hash — PASS
hash is correctly computed from 6-field subset for each record in chain — PASS (recomputes via computeHash and compares)

5. Pinned-hash determinism

Test name: createThoughtRecord — deterministic injection › produces a pinned hash matching the P0.7.1 snapshot for the canonical subset

Pinned hash: 6a2f9597f563d5515cfa69891a51806d0f93bfbe222997d3ba37c365ceee3f1a

This hash was first pinned in src/__tests__/trail-schema.test.ts (P0.7.1, commit 6c26bb58) for input:

{"content":"hello","id":"r1","prev_hash":"0000...0000","task_id":"t1","timestamp":"2026-04-17T00:00:00Z","type":"plan"}

(canonical-JSON sorted key order)

The P0.7.2 repository test reuses the same input with idFn: () => 'r1' and nowFn: () => '2026-04-17T00:00:00Z' and confirms the same hash is produced, proving that repository.ts delegates to the same computeHash primitive as schema.ts without re-implementation.

Outcome: PASS — cross-session hash invariance confirmed.

6. Rebase

Origin/main had advanced 2 commits (cb9befaf P0.2.4, 6e443196 P0.3.2) since this branch was cut.

Conflict resolved: src/db/schema.sql — both the β tasks section (from HEAD) and the ζ thought_records section (ours) were kept. No logic conflict.

Migration renumbered: 004_thought_records.sql → 003_thought_records.sql (origin/main only has 001 + 002; no 003 epsilon migration was merged yet).

References updated: src/db/index.ts comment, src/domains/trail/repository.ts comment header, src/db/schema.sql migration table.

7. Server wiring

registerThoughtTools(ctx) is called in src/server.ts::bootstrap() immediately after registerHealthTool(ctx). Import added at line 49. Both thought_record and thought_record_list are registered at server startup and lazy-resolve the DB via getDb() at call-time per the P0.2.3 transport-first startup contract.

8. Residual risks

MCP handler closures uncovered (lines 377, 390–397): The thought_record and thought_record_list tool handler bodies require a live initialized DB. Coverage is 85.71% — the gap is documented. A future P0.7.3 integration test suite (or the server.test.ts bootstrap harness extended for ζ) could close this.
Migration numbering fragile: 003_thought_records.sql assumes ε Skill Registry’s CRUD migration (P0.6.2, currently in-flight draft PR #127) does not use 003. If P0.6.2 also creates 003_*, a renumber conflict will occur at merge time. This is expected and resolvable at merge time.
P0.7.3 verifier deferred: The audit_verify_chain MCP tool (chain integrity traversal) is out of scope for P0.7.2. listThoughtRecords and getThoughtRecord are the read primitives it will use.

9. Compliance

No edits to main checkout (E:/AMS) — all changes in .worktrees/claude/p0-7-2-thought-crud
No commits on main
No force-push
No --no-verify bypass
GITHUB_TOKEN unset before push
All 5 executor-chain steps completed: audit + contract + packet (prior sessions) + impl + verify (this session)