feat(evaluation): parent-home rubric pack — fixtures, journeys, harness protocols (P1–P6)

[obvious-autobuild]

Acceptance criteria

1. Candidate-agnostic. The pack is data-only fixtures + a six-method HomeCandidateAdapter seam + a deterministic runner. No candidate code is imported; scoring runs bun src/home/run.ts --adapter=<path> against any conforming implementation.
2. Pre-registered rubric fidelity. Implements gates G1–G7 of the frozen rubric (art_uWsp80Fg v1.0, authored before any candidate output was read): fail-closed authorization (G1), idempotent publish (G2), raw SHA-256 fidelity (G3), read-only Q&A (G4), fiction-free extraction (G5), append-only corrections (G6), gap/window disclosure (G7).
3. Deterministic evidence. No network, no live LLM. Worked example passes 7/7 protocols; the negative control (--expect-failure) fails on exactly its encoded violations.
4. DST-safe pinned epochs. Every fixture epoch is machine-derived via the fixed-offset method (derive-epochs.ts), for the Nov 1 2026 America/New_York fall-back day (Nov instants EST, Oct seed days EDT), and re-asserted at import — timestamps.ts aborts every entry point on drift.
5. Structural validation. validate.ts re-asserts fixture↔timestamp equality and fixture structure before any run.
6. Merged corpus untouched and green. The existing src/run.ts harness and its negative control still pass unmodified.
7. Strict typecheck. tsc --noEmit clean for the pack.

What's in the pack

• evaluation/fixtures/home/ — utterances.json (voice u1, text-parity twin u2, interrupted-and-resumed u1b, dad's u3 with three-heads fiction; correction/rejection/bogus-target cases; Ruth's questions; authorization probes), mini-history.json (5-day published seed, deliberate Oct 29 gap, private-audience entry, pre-seeded correction chain), journeys.json (five journeys).
• evaluation/src/home/ — adapter seam, matcher, P1–P6 runner, structural validator, self-asserting timestamps, provenance derivation script, README.
• evaluation/src/home/example/ — worked example adapter (7/7) and a negative-control adapter failing only on encoded violations.
• evaluation/package.json — test chains validate + example + negative control; adds eval:home, eval:home:broken, validate:home.

Verification (tested HEAD: b41171b)

• bunx tsc --noEmit — clean
• bun src/home/validate.ts — PASS (utterances, mini-history, journeys)
• bun src/home/run.ts — 7/7 protocols PASS
• bun src/home/run.ts --adapter=./src/home/example/home-broken-adapter.ts --expect-failure — fails as encoded, exit 0
• bun src/run.ts + broken control — green (merged corpus untouched)
• Branch rebased onto origin/master (652ace5); all suites re-run and green on the exact rebased HEAD b41171b.

Non-goals

• No candidate scoring and no base/graft recommendation here — that begins only after this pack merges and candidate handoff artifacts exist.
• This is evaluator infrastructure, not an arena/candidate-* branch: it follows the normal review→merge workflow.