P3.9.1 — Fork Trigger Hook (ι handoff stub) — Verification
Round: R89 θ Wave 5
Branch: feature/p3-9-1-fork-hook
Worktree: .worktrees/claude/p3-9-1-fork-hook
Audit: p3-9-1-fork-hook-audit.md
Contract: p3-9-1-fork-hook-contract.md
Packet: p3-9-1-fork-hook-packet.md
Owner: T3 executor
Date: 2026-05-13
§1. Gate results
| Gate | Command | Result |
|---|---|---|
| Build | npm run build |
PASS — tsc exit 0; copy-migrations postbuild step ran cleanly. |
| Lint | npm run lint |
PASS — eslint src exit 0; no warnings, no errors. |
| Tests (suite only) | npx jest src/__tests__/domains/consensus/fork-hook.test.ts |
PASS — 15 / 15 tests in the new suite, 1 suite total. |
| Tests (full) | npm test |
PASS — 3059 / 3059 across 68 suites. |
Two consecutive clean runs of the full suite at 3059/3059 confirm the +15 delta is stable.
§2. Baseline reconciliation
Pre-merge baseline run on origin/main @ b5f3ffd5 (before any of this branch’s commits): 3044 tests total, 3040 passing, 3 failing in src/__tests__/domains/reputation/tools.test.ts (better-sqlite3 prepare() invocation issue, unrelated to consensus / fork-hook).
First full-suite run on this branch: 2 failures in src/__tests__/domains/reputation/witnesses.test.ts (different file from the baseline failure!) — these did NOT reproduce on subsequent runs. Two consecutive re-runs landed 3059 / 3059 / 0 failures, confirming the original reputation failures are pre-existing flakes (likely test-order or sqlite worker timing-sensitive), not regressions introduced by this branch.
| Metric | Value |
|---|---|
Baseline at b5f3ffd5 (worst case) |
3040 passing / 3044 total |
| This branch (best case, 2 consecutive runs) | 3059 passing / 3059 total |
| Delta from clean baseline | +15 tests, 0 regressions |
| Delta from worst-case baseline | +19 (15 new + 4 flaked-then-recovered) |
The dispatch-packet target of “expect +10-15 — S task” is satisfied at +15.
§3. Acceptance criteria checklist
From the dispatch packet (§P3.9.1 source + Wave 5 dispatch packet):
| # | Acceptance bullet | Status | Evidence |
|---|---|---|---|
| AC1 | type ForkReason = "CONSENSUS_SPLIT" \| "PARTITION_RECOVERY" |
PASS | fork-hook.ts sec.1 line declares the type alias verbatim. |
| AC2 | type ForkTriggerEvent shape with 5 readonly fields |
PASS | fork-hook.ts sec.1 — interface with round_id: bigint, divergent_roots: readonly Buffer[], reason: ForkReason, rule_version_hash: Buffer, timestamp_logical: bigint. All readonly. |
| AC3 | type ForkHookHandler = (event: ForkTriggerEvent) => void \| Promise<void> |
PASS | fork-hook.ts sec.1 — exact signature. |
| AC4 | class ForkHookRegistry with register / fire / clear / handlers |
PASS | fork-hook.ts sec.2 — class with the four methods, signatures match the contract. |
| AC5 | Default handler is no-op | PASS | noOpHandler exported; body is void _event;. |
| AC6 | Fires when θ cannot reach quorum within 2 * T_timeout |
PASS (spec-level) | Documented in module header. Wiring into RoundState is explicitly OUT OF SCOPE (Phase 5 ι). |
| AC7 | Payload populated from RoundState |
PASS (spec-level) | Documented in module header sec.ForkTriggerEvent JSDoc — field-by-field map to RoundState methods. Extraction logic itself is the caller’s job in Phase 5+. |
| AC8 | Handlers run sequentially; one handler’s error does NOT prevent others | PASS | Tests T4a (sync throw) and T4b (rejected Promise). Both confirm handlers 2 and 3 still invoked. |
| AC9 | ι implementation OUT OF SCOPE | PASS | See §6 below. No fork-id, no state copy, no schema rows, no round-state.ts edits. |
| AC10 | npm run build && npm run lint && npm test pass |
PASS | §1 above. |
§4. Test enumeration
15 jest blocks in the new suite (14 planned + 1 split: T4 split into T4a sync-throw and T4b rejected-Promise variants for explicit coverage):
| ID | Test name | Group |
|---|---|---|
| T1 | register + fire delivers payload to handler |
registration |
| T8 | handlers() returns appended list with identity preserved |
registration |
| T12 | register permits duplicates (no implicit de-dup) |
registration |
| T2 | zero handlers, fire is no-op (does not throw) |
fire |
| T3 | three handlers run in registration order |
fire |
| T4a | sync throw in handler-1 does not skip handlers 2 and 3 |
fire |
| T4b | rejected Promise in handler-1 does not skip handlers 2 and 3 |
fire |
| T9 | async handler is awaited before the next handler runs |
fire |
| T5 | clear() removes all handlers |
clear |
| T13 | clear() is idempotent |
clear |
| T14 | clear() then register() then fire() works normally |
clear |
| T6 | noOpHandler does not crash on a valid event |
defaultRegistry |
| T10 | defaultRegistry has noOpHandler pre-registered on module load |
defaultRegistry |
| T7 | payload shape matches contract (5 fields, correct runtime types) |
shape |
| T11 | Phase 3 only emits CONSENSUS_SPLIT (fixture documents this contract) |
shape |
Total: 15 tests, all passing.
§5. Invariant coverage
13 invariants from the contract (§4) mapped to tests:
| Inv | Description | Test | Result |
|---|---|---|---|
| I1 | fire(e) on empty registry never throws |
T2 | PASS |
| I2 | Sync throw doesn’t skip later handlers | T4a | PASS |
| I3 | Promise rejection doesn’t skip later handlers | T4b | PASS |
| I4 | Handlers run in registration order | T3 | PASS |
| I5 | Async handlers awaited before next | T9 | PASS |
| I6 | clear() empties registry |
T5 | PASS |
| I7 | clear → register → fire works |
T14 | PASS |
| I8 | No Math.*, Date.*, Math.random, floats in module body |
(visual audit + §7 below) | PASS |
| I9 | No ι fork-creation logic in module body | (visual audit + §6 below) | PASS |
| I10 | defaultRegistry ships with exactly one handler |
T10 | PASS |
| I11 | noOpHandler does not throw on a valid event |
T6 | PASS |
| I12 | register() permits duplicates |
T12 | PASS |
| I13 | clear() is idempotent |
T13 | PASS |
§6. Confirmation: NO ι fork-creation logic
Per the dispatch packet’s “CRITICAL SCOPE” clause and forbidden list, this slice ships only the hook surface. Confirmation by inspection:
| ι feature | Present in this PR? |
|---|---|
fork_id = SHA-256(parent_fork_id ‖ divergence_event_id ‖ rule_version_hash ‖ reason) computation |
NO — no createHash, no sha256, no fork_id reference anywhere. |
Fork row creation in mcp_consensus_forks (or any DB write) |
NO — no db.* calls, no SQL, no schema migration. |
| State copy / branch state allocation | NO — the registry only holds function refs; no per-fork state. |
Partition monitor that distinguishes PARTITION_RECOVERY from CONSENSUS_SPLIT |
NO — PARTITION_RECOVERY is declared in the type alias for forward compatibility but never produced. |
Edits to src/domains/consensus/round-state.ts |
NO — git diff origin/main -- src/domains/consensus/round-state.ts is empty. |
| Edits to any other existing consensus module | NO — git diff origin/main -- src/domains/consensus shows only fork-hook.ts added. |
The default handler noOpHandler is intentionally void — Phase 5 ι replaces it with a real fork-creation handler via defaultRegistry.clear() + defaultRegistry.register(realHandler).
§7. Forbidden-token confirmation (κ-determinism scope)
Quick grep for the four forbidden token classes in the new module body:
| Token class | Pattern | Hits in src/domains/consensus/fork-hook.ts |
|---|---|---|
Math.* |
\bMath\. |
0 |
Date.* |
\bDate\. |
0 |
Math.random |
Math\.random |
0 |
| Floating-point literals | (any decimal like 0.1, 1.5, 3.14) |
0 — only bigint operations in tests (42n, 100n, etc.), zero floats. |
The body has no arithmetic, no time reads, no randomness — only array push, try/catch, and handler invocation. κ-determinism is trivially satisfied.
§8. File summary
§8.1 Files created (2)
| Path | Lines | Purpose |
|---|---|---|
src/domains/consensus/fork-hook.ts |
199 | ForkReason, ForkTriggerEvent, ForkHookHandler, ForkHookRegistry, noOpHandler, defaultRegistry. |
src/__tests__/domains/consensus/fork-hook.test.ts |
254 | 15 jest blocks across 5 groups. |
§8.2 Documentation created (4 — 5-step chain artifacts)
| Path | Step |
|---|---|
docs/audits/p3-9-1-fork-hook-audit.md |
1. Audit |
docs/contracts/p3-9-1-fork-hook-contract.md |
2. Contract |
docs/packets/p3-9-1-fork-hook-packet.md |
3. Packet |
docs/verification/p3-9-1-fork-hook-verification.md |
5. Verify (this file) |
§8.3 Files NOT touched (declared in audit §1)
src/domains/consensus/round-state.ts— fire-point integration is a future ι-specific slice.- All other consensus modules — read-only consumption.
- No schema migration. No
src/server.tsregistration (fork-hook has no MCP surface; it’s pure infrastructure).
§9. Commit chain
| Step | SHA (short) | Subject |
|---|---|---|
| 1. Audit | 593a8142 |
audit(p3-9-1-fork-hook): inventory ι handoff surface |
| 2. Contract | 6295a513 |
contract(p3-9-1-fork-hook): behavioral contract for ι handoff registry |
| 3. Packet | 05b75551 |
packet(p3-9-1-fork-hook): execution plan for fork-hook surface |
| 4. Implement | df698b8b |
feat(p3-9-1-fork-hook): ForkHookRegistry + ι handoff stub |
| 5. Verify | (this commit) | verify(p3-9-1-fork-hook): gate evidence + acceptance closure |
Five commits as required by CLAUDE.md §6.
§10. Exit criteria for Step 5
- All four gates (build / lint / suite / full-test) PASS — §1.
- +15 new tests vs baseline; 0 regressions confirmed on two consecutive runs — §2.
- All 10 acceptance bullets satisfied — §3.
- 15 tests enumerated and grouped — §4.
- All 13 invariants mapped to tests, all PASS — §5.
- No ι fork-creation logic in the PR — §6.
- No forbidden tokens in module body — §7.
- 2 source files, 4 docs, 0 edits to existing code — §8.
- 5 commits matching the chain template — §9.
Step 5 complete. Ready for PR.