Codex fixes#1, #2, #3 from the plan's outside-voice review. Enforcement
shifts from SOFT-VIA-TYPE-COMMENT to SOFT-VIA-SANITIZED-OBJECT. Hard
enforcement via process isolation waits for BrainBench v2 Docker sandbox.
**eval/runner/types.ts** additions:
- `PublicPage = Pick<Page, 'slug' | 'type' | 'title' | 'compiled_truth' |
'timeline'>` — the exact 5 fields adapters should see. No _facts.
No frontmatter (a known hiding spot for accidental gold leaks).
- `sanitizePage(p: Page): PublicPage` — returns a NEW object with the 5
fields only. Cannot be bypassed by `(page as any)._facts` because the
field does not exist on the sanitized object.
- `PublicQuery = Omit<Query, 'gold'>` — strips the gold field.
- `sanitizeQuery(q: Query): PublicQuery` — enumerates public fields
explicitly (not spread+delete) so no prototype weirdness leaves gold
reachable.
**eval/runner/multi-adapter.ts** — scoreOneRun now calls sanitizePage /
sanitizeQuery before passing to adapter.init / adapter.query. The scorer
retains the full Query shape (including gold.relevant) for precision /
recall computation. Adapter signatures unchanged — the sealing is at the
OBJECT level, not the type level. This keeps existing adapters
(ripgrep-bm25, vector-only, hybrid-nograph, gbrain-after) binary-compatible.
Verified: no existing adapter reads q.gold or page._facts, so the change
is safe without further adapter updates.
**test/eval/sealed-qrels.test.ts** (17 tests):
- sanitizePage strips _facts + frontmatter + arbitrary hidden keys
- Output has exactly the 5 public keys (deep introspection)
- Proxy tripwire simulates a malicious adapter: any access to _facts or
gold throws `sealed-qrels violation`
- sanitizeQuery retains optional fields (as_of_date, tags, author,
acceptable_variants, known_failure_modes) but omits undefined ones
- Honest documentation of the seal's limits: filesystem bypass and
Proxy attacks would still work in v1; Docker isolation (v2) is the
real enforcement
Every existing eval test still passes (273 before + 17 sealed-qrels = 290).
Total eval suite now: 290 pass, 0 fail.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>