# AI Authority Classification Engine

## Module
Attestor

## Status
IMPLEMENTED

## 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**: `__Libraries/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