semi implemented and features implemented save checkpoint

docs/features/unchecked/attestor/policy-studio-copilot-attestation.md

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+# Policy Studio Copilot Attestation
+
+## Module
+Attestor
+
+## Status
+IMPLEMENTED
+
+## Description
+Policy draft attestation types for AI-generated lattice rules with test case generation and signed snapshots.
+
+## Implementation Details
+- **AI Policy Draft Statement**: `src/Attestor/__Libraries/StellaOps.Attestor.ProofChain/Statements/AI/AIPolicyDraftStatement.cs` -- in-toto statement wrapping an AI-generated policy draft.
+- **AI Policy Rule Draft**: `Predicates/AI/AIPolicyRuleDraft.cs` -- individual AI-generated policy rule with condition, action, and severity.
+- **Policy Rule Type**: `Predicates/AI/PolicyRuleType.cs` -- enum of rule types (Gate, Advisory, Informational).
+- **Policy Rule Test Case**: `Predicates/AI/PolicyRuleTestCase.cs` -- auto-generated test case for validating the drafted policy rule.
+- **Policy Validation Result**: `Predicates/AI/PolicyValidationResult.cs` -- result of validating the drafted policy against test cases.
+- **AI Authority Classifier**: `Predicates/AI/AIAuthorityClassifier.cs` (with `.PolicyDraft`, `.PolicyDraftScore`) -- classifies AI-generated policy drafts by authority level (Suggestion, EvidenceBacked, AuthorityThreshold).
+- **AI Model Identifier**: `Predicates/AI/AIModelIdentifier.cs` -- identifies the AI model that generated the policy draft (provider, model, version, weights digest).
+- **AI Decoding Parameters**: `Predicates/AI/AIDecodingParameters.cs` -- captures model parameters (temperature, top-p, max tokens) for reproducibility.
+- **DSSE Signing**: `Signing/ProofChainSigner.cs` -- signs policy draft attestations for immutability.
+- **Tests**: `__Tests/StellaOps.Attestor.ProofChain.Tests/AIPolicyDraftTests.cs`
+
+## E2E Test Plan
+- [ ] Create an `AIPolicyDraftStatement` with multiple `AIPolicyRuleDraft` entries and verify the statement structure
+- [ ] Generate `PolicyRuleTestCase` entries for a drafted rule and verify they cover positive and negative scenarios
+- [ ] Validate the drafted policy via `PolicyValidationResult` and verify it passes all generated test cases
+- [ ] Classify the policy draft via `AIAuthorityClassifier.PolicyDraft` and verify the authority level based on evidence quality
+- [ ] Verify `AIModelIdentifier` captures the model that generated the draft (e.g., provider="anthropic", model="claude-opus-4-6")
+- [ ] Verify `AIDecodingParameters` captures reproducibility parameters (temperature, seed)
+- [ ] Sign the policy draft statement via `ProofChainSigner` and verify the DSSE envelope is valid
+- [ ] Create policy drafts of different `PolicyRuleType` (Gate, Advisory, Informational) and verify type-specific behavior