test(phase-7-9): audit verification, fault injection, integration tests
Implement V.7, V.9, and integration test requirements:
Audit Verification (V.7):
- TestAuditVerificationJob: Chain verification and tamper detection
Fault Injection (V.9):
- TestNVMLUnavailableProvenanceFail, TestManifestWritePartialFailure
- TestRedisUnavailableQueueBehavior, TestAuditLogUnavailableHaltsJob
- TestConfigHashFailureProvenanceClosed, TestDiskFullDuringArtifactScan
Integration Tests:
- TestCrossTenantIsolation: Filesystem isolation verification
- TestRunManifestReproducibility: Cross-run reproducibility
- TestAuditLogPHIRedaction: PHI leak prevention