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docs/features/checked/attestor/ai-authority-classification-engine.md

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+# AI Authority Classification Engine
+
+## Module
+Attestor
+
+## Status
+VERIFIED
+
+## Description
+Authority classification engine that determines whether AI outputs are evidence-backed (authoritative) or suggestion-only, with configurable thresholds and scoring across multiple artifact types.
+
+## Implementation Details
+- **Core Classifier**: `src/Attestor/__Libraries/StellaOps.Attestor.ProofChain/Predicates/AI/AIAuthorityClassifier.cs` -- partial class with `DetermineAuthority()` method that evaluates `citationRate`, `verifiedRate`, `confidenceScore`, and `qualityScore` against configurable thresholds.
+- **Artifact-Specific Scoring**: Partial files implement scoring for each artifact type:
+  - `AIAuthorityClassifier.Explanation.cs` / `AIAuthorityClassifier.ExplanationScore.cs` -- explanation classification and scoring
+  - `AIAuthorityClassifier.PolicyDraft.cs` / `AIAuthorityClassifier.PolicyDraftScore.cs` -- policy draft classification
+  - `AIAuthorityClassifier.Remediation.cs` / `AIAuthorityClassifier.RemediationScore.cs` -- remediation plan classification
+  - `AIAuthorityClassifier.VexDraft.cs` / `AIAuthorityClassifier.VexDraftScore.cs` -- VEX statement draft classification
+- **Authority Levels**: `AIArtifactAuthority.cs` -- `Suggestion` (no evidence backing), `EvidenceBacked` (citations verified, evidence resolvable), `AuthorityThreshold` (auto-processing eligible)
+- **Thresholds Config**: `AIAuthorityThresholds.cs` -- `MinCitationRate` (0.8), `MinConfidenceScore` (0.7), `MinVerifiedCitationRate` (0.9), `AuthorityThresholdScore` (0.95), `RequireResolvableEvidence` (true)
+- **Classification Result**: `AIAuthorityClassificationResult.cs` -- captures authority level, reasons, and individual scores
+- **Evidence Resolution**: Constructor accepts optional `Func<string, bool>` evidence resolver to verify that cited evidence IDs are resolvable
+- **Tests**: `src/Attestor/__Tests/StellaOps.Attestor.ProofChain.Tests/AI/AIAuthorityClassifierTests.cs`
+
+## E2E Test Plan
+- [ ] Classify an explanation with all metrics above thresholds and verify `EvidenceBacked` result with three reason entries (citation rate, verified rate, confidence)
+- [ ] Classify a policy draft with `qualityScore >= 0.95` and verify `AuthorityThreshold` result regardless of other metrics
+- [ ] Classify a remediation plan with `citationRate = 0.5` and verify `Suggestion` result with reason mentioning citation rate below threshold
+- [ ] Classify a VEX draft with an evidence resolver that returns `false` for some evidence IDs and verify the verified rate drops below threshold
+- [ ] Override `AIAuthorityThresholds` with stricter values (e.g., `MinCitationRate = 0.95`) and verify classification changes accordingly
+- [ ] Verify all four artifact-type classifiers (Explanation, PolicyDraft, Remediation, VexDraft) produce correct `AIAuthorityClassificationResult` with type-specific scoring
+
+## Verification
+- Verified on 2026-02-11 with `run-002`.
+- Tier 0 source checks passed for classifier core, thresholds, authority enums, scoring partials, and classification-result model.
+- Tier 1 build passed; scoped xUnit class run passed (`11/11`) including policy-threshold and VEX evidence-resolvability downgrade scenarios.
+- Tier 2 behavioral checks passed across Explanation, PolicyDraft, Remediation, and VEX draft classification paths.
+- Full ProofChain suite remains red on unrelated baseline failures (`35 failed / 780 total`); evidence captured for traceability.
+- Evidence:
+  - `docs/qa/feature-checks/runs/attestor/ai-authority-classification-engine/run-002/tier0-source-check.json`
+  - `docs/qa/feature-checks/runs/attestor/ai-authority-classification-engine/run-002/tier1-build-check.json`
+  - `docs/qa/feature-checks/runs/attestor/ai-authority-classification-engine/run-002/tier2-integration-check.json`