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OCEAN-SENTINEL — PATH B FINAL TARGETED CLOSURE VERIFICATION V1

TASK ID: OCEAN-SENTINEL-PATH-B-FINAL-CLOSURE-VERIFICATION-V1
DATE: 2026-09-27
REVIEWER: Independent Final Closure Reviewer

1. REVIEW STATUS

COMPLETE — All 10 checks executed, all counterexamples verified, all protected hashes confirmed, all relevant regression tests passing.

2. MD-01 RESULT: LINEAGE HASH SEMANTICS — FIXED

Aspect Verification
Field renamed LineageRecord.content_sha256 → lineage_sha256 throughout codebase
Documentation Explicit "Decision 1" block in LineageRecord docstring and §4 of architecture doc
Semantic clarity States: "proves derivational lineage identity only... does NOT prove: payload integrity, authenticity, authentication, non-repudiation"
No stale references Verified: no content_sha256 remains in path_b.py, tests, or docs
Payload integrity Explicitly deferred to future scope ("canonical, circularity-free payload serialization")
Adversarial test test_adversarial_lineage_hash_is_not_content_hash passes — confirms two objects with different payloads but same lineage params produce identical lineage_sha256

Status: ✅ MATERIAL DEFECT RESOLVED

3. MD-02 RESULT: MISSING TIMESTAMP FABRICATION — FIXED

Aspect Verification
No epoch fabrication CandidateRegion.to_evidence_item() sets obs_time = self.acquisition_timestamp_utc — genuinely None when absent
EvidenceItem supports None fusion.py:206-212 — observation_time is now Optional[datetime] with None handling
Seal computation fusion.py:247 — obs_time_str = "none" when None, no epoch sentinel
Serialization to_dict() returns observation_time_utc: null
Limitations Includes "NO_AUTHORITATIVE_TIMESTAMP" flag
Adversarial test test_adversarial_timestamp_fabrication_never_uses_epoch passes — verifies observation_time is None and != datetime.fromtimestamp(0, tz=timezone.utc)

Status: ✅ MATERIAL DEFECT RESOLVED

4. MD-03 RESULT: DERIVED VS OBSERVED SEMANTICS — FIXED

Aspect Verification
Correct status CandidateRegion.to_evidence_item() line 438: observed_vs_inferred=ObservationStatus.INFERRED
Derivation type derivation_type=DerivationType.DERIVED_ANALYSIS (unchanged, correct)
No duplicate enum Uses canonical ObservationStatus from fusion.py — no Path B fork
Adversarial test test_adversarial_derived_observation_status_is_inferred passes — verifies INFERRED not OBSERVED

Status: ✅ MATERIAL DEFECT RESOLVED

5. SR-01 RESULT: PHYSICAL T0/T1 VALIDATION SYMMETRY — RESOLVED

Aspect Verification
T1 validation Unchanged — requires authoritative provenance, present timestamp
T0 validation Added — symmetric validation when T0 participates in repeat-pass reasoning
Trigger condition is_repeat_pass = temporal_status != SINGLE_PASS_UNOBSERVED_PRIOR or t0_scene_id or t0_acquisition_utc
SINGLE_PASS Correctly allows absent T0 (no prior scene to validate)
Adversarial test test_adversarial_t0_t1_physical_provenance_validation passes all 5 cases:
1. Both valid → PASS
2. Invalid T0 + valid T1 → FAIL
3. Valid T0 + invalid T1 → FAIL
4. Missing T0 on repeat-pass → FAIL
5. Missing T1 → FAIL

Status: ✅ SEMANTIC RISK RESOLVED (CAO Decision 4 implemented)

6. SR-02 RESULT: CANONICAL EVIDENCE SEMANTICS — RESOLVED

Aspect Verification
EvidenceItem canonical CandidateRegion.to_evidence_item() returns canonical EvidenceItem from fusion.py
No fork Uses canonical enums: ProvenanceClass, ObservationStatus, DerivationType, SourceType, EvidenceType
Translation boundary Documented as "Canonical Evidence Translation Boundary" (Boundary 9) in architecture doc
Path B contracts Intermediate stage contracts only; explicit to_evidence_item() translation
Adversarial test test_adversarial_canonical_semantics_reuse_not_fork passes — verifies all enums are canonical values

Status: ✅ SEMANTIC RISK RESOLVED (CAO Decision 6 implemented)

7. SR-03 RESULT: DEFENSIVE REVALIDATION — RESOLVED

Aspect Verification
Revalidation in to_evidence_item() Lines 411-413: calls self.validate_fail_closed_provenance() before assigning VERIFIED_OPERATIONAL
Mutation detection Catches post-instantiation mutation of: acquisition_timestamp_utc, timestamp_provenance, lineage.is_synthetic
Fail closed All mutations raise ProvenanceGateViolationError
Adversarial test test_adversarial_defensive_revalidation_catches_mutation passes all 3 mutations:
1. acquisition_timestamp_utc = None → rejected
2. timestamp_provenance = UNKNOWN → rejected
3. lineage.is_synthetic = True → rejected

Status: ✅ SEMANTIC RISK RESOLVED (CAO Decision 5 implemented)

8. REGRESSION RESULTS

Test Suite Tests Result
test_path_b_contracts.py 15 (9 original + 6 adversarial) ✅ 15 PASSED
test_evidence_fusion.py 39 ✅ 39 PASSED
test_temporal.py 22 ✅ 22 PASSED
test_ais.py 13 ✅ 13 PASSED
test_pipeline_orchestration.py 12 ✅ 12 PASSED
test_backend_api.py 20 ✅ 20 PASSED
test_interpretation.py 15 ✅ 15 PASSED
test_drift.py 21 ✅ 21 PASSED
Total 157 ✅ 157 PASSED

Breakdown: Path B total = 15 (9 foundational + 6 adversarial); Canonical non-Path-B total = 142 (39 + 22 + 13 + 12 + 20 + 15 + 21); Overall relevant total = 157. (The 6 adversarial tests are internal to the 15 Path B contract tests, not additive beyond them.)

Command executed:

.venv\Scripts\python -m pytest tests/test_path_b_contracts.py tests/test_evidence_fusion.py tests/test_temporal.py tests/test_ais.py tests/test_pipeline_orchestration.py tests/test_backend_api.py tests/test_interpretation.py tests/test_drift.py -v

Note: 31 ML/experiment test modules fail to collect due to missing torch/PIL dependencies (GPU-dependent tests not relevant to Path B contract verification). All core Path B and canonical module tests pass.

9. PROTECTED HASH RESULTS

File Authoritative SHA-256 Verified SHA-256 Status
.gitignore a664092c8717f70f88941dce08d8000e29cdcb453df9b1d64d9eeaeb3dbd0444 a664092c8717f70f88941dce08d8000e29cdcb453df9b1d64d9eeaeb3dbd0444 IDENTICAL
src/ocean_sentinel/ingestion/dataset.py f5bf1387769e43462af8e4e4de37867c761dd7adbc040455532a3463ebfa0b0c f5bf1387769e43462af8e4e4de37867c761dd7adbc040455532a3463ebfa0b0c IDENTICAL
src/ocean_sentinel/governance/runner.py dd345558c3118ee61c0c966744d539c66dcfaabeab2b9c66b03903c66eb3c9e0 dd345558c3118ee61c0c966744d539c66dcfaabeab2b9c66b03903c66eb3c9e0 IDENTICAL
data/metadata/governance_v2/rules.json b216f369d68a027e4708e8cbcf3991d8effd5ba5a063a3b8b6b3fc2261d85c4e b216f369d68a027e4708e8cbcf3991d8effd5ba5a063a3b8b6b3fc2261d85c4e IDENTICAL
data/metadata/governance_v2/lessons.json 4784a440070bc00612bc3bfa9b29a7acc181934f894a9e22bd340faab7076395 4784a440070bc00612bc3bfa9b29a7acc181934f894a9e22bd340faab7076395 IDENTICAL
data/metadata/governance_v2/incidents.json fa3051a185894ee1fe46edb5825ebcfe92b107f80fb7527bf5746d4ec5b91836 fa3051a185894ee1fe46edb5825ebcfe92b107f80fb7527bf5746d4ec5b91836 IDENTICAL
src/ocean_sentinel/temporal.py 46614361e1be20a278d0af9ceee222e4787df1eade7d52a88b372965170e26cf 46614361e1be20a278d0af9ceee222e4787df1eade7d52a88b372965170e26cf IDENTICAL

Status: ✅ ALL 7 PROTECTED FILES BIT-FOR-BIT IDENTICAL

10. DOCUMENTATION / LEARNING CHECK

Lesson Documented In
1. lineage identity ≠ content identity path_b.py LineageRecord docstring (§4 "Decision 1"), docs/path_b_architecture_foundation.md §4
2. missing metadata ≠ fabricated metadata path_b.py CandidateRegion.to_evidence_item() docstring ("Decision 2 / MD-02"), architecture doc §2 Boundary 8
3. derived analysis ≠ direct observation path_b.py CandidateRegion.to_evidence_item() docstring ("Decision 3 / MD-03"), architecture doc §3 Stage 2
4. repeat-pass physical reasoning requires valid temporal provenance path_b.py TemporalEvidence.validate_fail_closed_provenance() ("Decision 4 / SR-01"), architecture doc §3 Stage 4
5. constructor validation insufficient for mutable objects path_b.py CandidateRegion.to_evidence_item() docstring ("Decision 5 / SR-03")
6. canonical evidence semantics must not fork Architecture doc §2 Boundary 9, path_b.py CandidateRegion.to_evidence_item() docstring

Adversarial tests explicitly named with ADV-XX IDs in test matrix (§6 of architecture doc) mapping to decisions.

Status: ✅ ALL 6 LESSONS EXPLICITLY DOCUMENTED — no documentation gaps

11. MATERIAL DEFECT COUNT

Status Count
Resolved 3 (MD-01, MD-02, MD-03)
Remaining 0

12. SEMANTIC RISK COUNT

Status Count
Resolved 3 (SR-01, SR-02, SR-03)
Remaining 0

13. DOCUMENTATION GAP COUNT

Status Count
Gaps 0

14. FINAL CLOSURE DECISION

CLOSED

All previously identified material defects (MD-01, MD-02, MD-03) have been corrected and verified via adversarial counterexample tests. All semantic risks (SR-01, SR-02, SR-03) have been resolved per CAO decisions. All 157 relevant regression tests pass. All 7 protected files remain bit-for-bit identical. All 6 architectural lessons are explicitly documented. No material defects remain.

REVIEWER: Independent Final Closure Reviewer
DATE: 2026-09-27
SIGNATURE: Verification complete — read-only review, no modifications performed.