Verification — P1.5.10 ζ Decision-Trail Integration

Round: R92, Wave 7 (parallel slice 2/2) Branch: feature/p1-5-10-zeta-integration Implementation SHA: 5ce017f5 (this verification commit lands on top) Base SHA: 6cfd269b (post-P1.5.7 #258)

§1. Test gate evidence

§1.1. npm run build 

> colibri@0.0.1 build
> tsc

> colibri@0.0.1 postbuild
> node scripts/copy-migrations.mjs

copy-migrations: copied 9 migration(s) E:\AMS\.worktrees\claude\p1-5-10-zeta-integration\src\db\migrations -> E:\AMS\.worktrees\claude\p1-5-10-zeta-integration\dist\db\migrations

Exit 0. No tsc diagnostics.

§1.2. npm run lint 

> colibri@0.0.1 lint
> eslint src

Exit 0. No lint findings.

§1.3. npm test (serial — --runInBand) 

Test Suites: 78 passed, 78 total
Tests:       3381 passed, 3381 total
Snapshots:   0 total
Time:        99.941 s, estimated 301 s
Ran all test suites.
  • Suite count: 78 / 78 passing.
  • Test count: 3381 / 3381 passing.
  • Baseline: 3353 at 6cfd269b.
  • Delta: +28 (27 in new zeta-emission.test.ts, 1 in fallback.test.ts).
  • Regression count: 0.

§1.4. Parallel-mode behaviour

A parallel run (npm test without --runInBand) shows the documented pre-existing flakes:

  • src/__tests__/domains/consensus/parity-harness.test.ts G7.1 — perf budget intermittently > 5000 ms on a loaded worker. Pre-existing per CLAUDE.md §5 (“pre-existing flake; retry-clean”).
  • src/__tests__/domains/reputation/{schema,witnesses}.test.ts — shared-state cross-suite races under parallel workers. Pre-existing.

Both clusters pass in isolation and under --runInBand (proved §1.3). None of these are introduced by P1.5.10.

§2. ζ event matrix

The RoutingDecisionRecord shape is the 8-field envelope from docs/3-world/social/llm.md §Decision-trail recording:

Field Type Value on routing_mode='single' Value on routing_mode='fail'
type literal 'routing_decision' 'routing_decision' 'routing_decision'
routing_mode union 'single' \| 'ensemble' \| 'pipeline' \| 'fail' 'single' 'fail'
chosen_model_id string winning ModelId (e.g. 'claude') '' (empty)
candidates_considered readonly string[] full chain order (scoreIntent descending) full chain order
scores Readonly<Record<string, number» 9-member score map from scoreIntent 9-member score map
fallback_attempts non-negative integer Math.max(0, modelsAttempted.length - 1) attempts.length
rule_version_hash 'rv:sha256:<64hex>' or 'rv:sha256:unavailable' normalised κ hash normalised κ hash
decision_hash 64-char lowercase hex SHA-256 of canonicalize(inputs) + ' ' + chosenModelId SHA-256 of canonicalize(inputs) + ' ' (empty chosen)

§2.1. decision_hash preimage

canonicalize(DecisionHashInputs) + ' ' + chosen_model_id where the DecisionHashInputs projection is:

{
  prompt,                              // user message
  context: {                           // optional sub-fields
    task?,                             // ScoreContext.task
    operatorPreference?,               // ScoreContext.operatorPreference
    candidatesSnapshot?: ModelId[],    // model_ids only (bigint elsewhere)
    weightsSnapshot?: Record<string, string>,  // bigints stringified
  },
  rule_version_hash,                   // 'rv:sha256:<hex>' or unavailable
  candidates_considered                // chain-walk order
}

Excluded (intentionally non-deterministic / secret / non-portable): completionFn, completionFnRegistry, scoringFn, fetchFn, logger, delayFn, nowFn, apiKey, tools, maxTokens, systemPrompt, model, zetaEmitter.

§3. Acceptance-criteria evidence (slice doc §Acceptance criteria)

AC Spec Evidence
1 Exact 8-field shape zeta-emission.test.ts §4 — buildRoutingDecisionRecord returns the exact 8-field shape (toEqual against fixture)
2 decision_hash deterministic input zeta-emission.test.ts §3 — is deterministic over JSON-equal inputs (passes); 4 sensitivity tests (chosen, candidates, rule version)
3 'fail' on FallbackChainExhaustedError zeta-emission.test.ts §6 — emits routing_mode="fail" before throwing (passes)
4 'single' on success zeta-emission.test.ts §5 — emits one record with routing_mode="single" (passes)
5 fallback_attempts counting zeta-emission.test.ts §7 — cascade case: chain [sonnet, claude], first fails, second succeeds → fallback_attempts === 1 (passes); §6 fail case → === attempts.length (passes)
6 Chain-thread prev_hash zeta-emission.test.ts §10 — hash-chain integrity: each prev_hash threads to the previous record (passes); 3 records, first uses ZERO_HASH, N+1 uses N’s hash
7 Emission failure non-fatal zeta-emission.test.ts §9 — a throwing emitter does NOT alter the success return value (passes); does NOT swallow the fail path throw (passes); logger captures “ζ emission failed”
8 Gates green npm run build && npm run lint && npm test all pass (§1)

§4. Behavioural-invariant evidence (contract §3)

ID Invariant Evidence
I1 routeRequest signature byte-identical RouteOptions extended additively; existing fallback.test.ts (88 tests) all pass — no destructuring caller broke.
I2 RouteResult shape byte-identical No RouteResult change; existing assertions on the 8 fields green.
I3 Default emitter is no-op zeta-emission.test.ts §8 — back-compat test (passes). fallback.test.ts new “back-compat guard” test (passes).
I4 Success emits one 'single' §5 test 1 (passes).
I5 Fail emits one 'fail' then throws §6 test 1 (passes).
I6 decision_hash deterministic §3 determinism test (passes).
I7 decision_hash is 64-hex §3 shape test, §5, §6 (all pass).
I8 rule_version_hash valid §5 test 4 (passes — regex match or 'rv:sha256:unavailable').
I9 Emission throws caught §9 (passes).
I10 RoutingDecisionRecord frozen §4 test 1 (Object.isFrozen(record)).
I11 createThoughtRecordEmitter writes a real row §10 (4 tests pass, including chain integrity).
I12 No edit to src/domains/trail/* git diff --name-only origin/main shows only src/domains/router/*.ts + src/__tests__/domains/router/*.ts + docs/* (verified §6).
I13 No edit to adapters Same as I12.
I14 No MCP tool registration tools.ts unmodified.

§5. ζ emitter opt-in confirmation

Default behaviour. RouteOptions.zetaEmitter is optional. When omitted, routeRequest uses NO_OP_ZETA_EMITTER — a frozen () => undefined. Phase 0 / Phase 1.5 W1–W6 callers that never knew about zetaEmitter see byte-identical RouteResult shapes and byte-identical FallbackChainExhaustedError throws.

Live evidence. fallback.test.ts was extended with one new test (“omitting zetaEmitter is byte-equivalent to the pre-P1.5.10 baseline”) which asserts result.model === 'claude', result.content === 'Hello!', result.finishReason === 'end_turn', and Object.isFrozen(result). Passes.

Opt-in path. Callers that want ζ persistence wire it explicitly:

import { createThoughtRecordEmitter } from './trail.js';
const emitter = createThoughtRecordEmitter({
  db: getDb(),
  task_id: 'some-task',
  agent_id: 'router-agent',
});
const result = await routeRequest(prompt, { zetaEmitter: emitter, ... });

createThoughtRecordEmitter is a real emitter (not a stub). It writes one row per call into the live thought_records chain via createThoughtRecord (the canonical ζ insert path), threading prev_hash. Tested against an in-memory DB in §10.

§6. Files touched 

docs/audits/p1-5-10-zeta-integration-audit.md             | + 309 lines (new)
docs/contracts/p1-5-10-zeta-integration-contract.md       | + 207 lines (new)
docs/packets/p1-5-10-zeta-integration-packet.md           | + 183 lines (new)
docs/verification/p1-5-10-zeta-integration-verification.md| + this file (new)
src/domains/router/trail.ts                               | + 376 lines (new)
src/domains/router/fallback.ts                            |   +147/-2  (edit — additive)
src/__tests__/domains/router/zeta-emission.test.ts        | + 519 lines (new)
src/__tests__/domains/router/fallback.test.ts             |   +16/-0   (edit — additive)

Zero deletes outside fallback.ts’s 2-line import addition. Zero edits to src/domains/trail/*, src/domains/router/adapters/*, scoring.ts, circuit.ts, cost.ts, tools.ts. Matches parent-prompt forbiddens.

§7. Sibling P1.5.8 race posture

P1.5.8 (parity tests, parallel sibling) ships a NEW file (src/__tests__/domains/router/parity.test.ts) and per the parent prompt “WILL NOT touch src/domains/router/fallback.ts”. My slice touches fallback.ts (additive — one new optional RouteOptions field

  • two emission call sites + four private helpers) and one new describe block at end of fallback.test.ts.

The two slices are disjoint at the source-file level (mine: fallback.ts

  • trail.ts (new); sibling’s: parity.test.ts (new)) and at the test-file level (mine: zeta-emission.test.ts (new) + one block in fallback.test.ts; sibling’s: parity.test.ts only). When merged sequentially in either order, the only merge-touch surface is the optional zetaEmitter field on RouteOptions — the sibling does not add a RouteOptions field, so the merge is straightforward.

§8. Out-of-scope confirmations

  • 4 MCP tool handlers in tools.ts are NOT wired to the emitter (deferred per contract §6).
  • routing_mode='ensemble' / 'pipeline' paths NOT exercised (deferred per contract §6).
  • THOUGHT_TYPES enum NOT modified (parent-prompt forbidden).
  • No new MCP tools registered (parent-prompt forbidden).
  • No new env vars (parent-prompt forbidden).

§9. Writeback (transcript-only; MCP unattached this round) 

task_id: P1.5.10
branch: feature/p1-5-10-zeta-integration
worktree: .worktrees/claude/p1-5-10-zeta-integration
base: origin/main @ 6cfd269b
commits:
  - 1ebae49e audit
  - 82b01e33 contract
  - 7714704a packet
  - 5ce017f5 feat (implementation)
  - <verify SHA — this commit>
tests:
  - npm run build
  - npm run lint
  - npm test (--runInBand)
test_count: 3381 (was 3353; delta +28)
suite_count: 78 (was 77)
summary: |
  ζ Decision-Trail emission for δ router. routeRequest now emits one
  RoutingDecisionRecord per call — routing_mode='single' on success,
  'fail' on FallbackChainExhaustedError. Emitter is opt-in via
  options.zetaEmitter; default is NO_OP_ZETA_EMITTER, preserving Phase 0
  and Phase 1.5 W1–W6 callers byte-identically. createThoughtRecordEmitter
  is the real implementation — writes rows through the canonical
  createThoughtRecord path, threading prev_hash. Emission failures are
  caught and logged via options.logger; they NEVER alter the
  RouteResult / thrown FallbackChainExhaustedError.

  Record shape (8 fields, exact match to docs/3-world/social/llm.md
  §Decision-trail recording):
    type, routing_mode, chosen_model_id, candidates_considered, scores,
    fallback_attempts, rule_version_hash, decision_hash

  decision_hash = SHA-256(canonicalize(inputs) + ' ' + chosen_model_id)
  where inputs is the deterministic projection of prompt + context +
  rule_version_hash + candidates_considered.

  rule_version_hash is sourced via computeScoringRuleVersionHash() from
  the κ shim and normalised to the 'rv:sha256:<hex>' wire shape; falls
  back to 'rv:sha256:unavailable' on KappaRulesUnavailableError without
  blocking emission.
blockers: []

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