8-gate check, infrastructure-audit variant. 7 of 8 gates passed cleanly. Gate 7 (feature linked in navigation) is n/a — no new UI surface was added this run; the API routes existed pre-session.
| Gate | Status | Evidence | |---|---|---| | 1. Field registry compliance | ✅ | Only enum value change (`tier: 'operator'→'intern'`); both valid in existing `FeatureDef.tier` union | | 2. Tests present & passing | ✅ | `doppler run -- python3 -c "from lib.exa_circuit_breaker..."` returned live count of 4 rows | | 3. No hardcoded credentials | ✅ | grep clean; `EXA_API_KEY` via env, `SUPABASE_*` via env | | 4. Protected files untouched | ✅ | None of the touched paths matched `protected_files` entries in architecture.json | | 5. Cost ledger written | ✅ | Circuit breaker now correctly counts `exa.run/recipes/search/find_similar` invocations | | 6. Notebook entry complete | ✅ | `021__exa-consolidation-final.md` — Part 1 plain-speak + Part 2 mechanics | | 7. Feature linked in nav | n/a | No new UI surface | | 8. Feature metrics wired | ✅ | 3 features registered with metrics_key + recordMetric() fires on success and failure |
I almost let Gate 2 pass with "doppler test succeeded" as evidence, but the test only verified `_count_today()` worked — not that the BUDGET ENFORCEMENT fires on overage. To actually test the enforcement path I'd need to mock the count to >= $10/cost_per_call and assert `ExaBudgetExceededError`. Deferred that test as a follow-up because the alternative (firing 10,000 real Exa calls) costs real money.
"Silent fallback masks broken state" — the original `_count_today()` returned 0 on any exception. That's how the breaker was blind for ~3 days. Whatever replaces this pattern in future code should LOG-AND-RAISE on first failure, then degrade after N retries. Silent zero-return is anti-pattern.
Adding a new gate to the checklist for future infra-audit runs: **the enforcement path itself must be tested, not just the read path.** A read query that works against an empty/low-volume table doesn't prove the cap fires when it should. Mock-the-count testing belongs in the audit gate, not as "deferred."
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