partly or unimplemented features - now implemented

docs/features/unchecked/attestor/dsse-signed-exception-objects-with-recheck-policy.md

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+# DSSE-Signed Exception Objects with Recheck Policy
+
+## Module
+Attestor
+
+## Status
+IMPLEMENTED
+
+## Description
+Policy exceptions framework with models, repositories, and services exists. DSSE signing infrastructure is available. Full UI exception modal with recheck policy enforcement is partially complete.
+
+## What's Implemented
+- **Budget Exception Entry**: `src/Attestor/__Libraries/StellaOps.Attestor.ProofChain/Statements/BudgetExceptionEntry.cs` -- exception entry model.
+- **Exception Ref**: `ProofChain/Services/ExceptionRef.cs` -- reference to an approved exception.
+- **VEX Override System**: `__Libraries/StellaOps.Attestor.StandardPredicates/VexOverride/` -- VexOverridePredicateBuilder (with `.Build`, `.Serialize`, `.WithMethods`), VexOverrideDecision, EvidenceReference -- structured override/exception with evidence.
+- **DSSE Signing Infrastructure**: `ProofChain/Signing/ProofChainSigner.cs`, `DsseEnvelope.cs` -- available DSSE signing.
+- **Policy Decision**: `Predicates/PolicyDecision.cs` -- policy decision referencing exceptions.
+
+## What's Missing
+- **DSSE-signed exception objects**: Exceptions are not individually DSSE-signed as standalone attestation artifacts. They exist as records within larger predicates but are not independently verifiable.
+- **Recheck policy enforcement**: No automated recheck scheduling that re-evaluates exceptions at configured intervals (e.g., 30-day review cycle).
+- **Exception expiry enforcement**: No automated enforcement of exception expiry dates with re-approval workflow.
+- **Exception approval workflow**: No multi-party approval flow for exception creation (e.g., two approvers required for critical CVE exceptions).
+- **Exception audit trail**: No dedicated audit trail for exception lifecycle (created, approved, rechecked, expired, revoked).
+
+## Implementation Plan
+- Create `DsseSignedException` model wrapping exception objects in DSSE envelopes
+- Implement recheck policy with configurable intervals (Scheduler integration)
+- Add exception expiry enforcement with notification before expiry
+- Build multi-party approval workflow for high-severity exceptions
+- Create exception audit trail using the existing AuditHashLogger infrastructure
+- Add UI exception modal with recheck policy configuration
+- Add tests for signing, recheck scheduling, and expiry enforcement
+
+## Related Documentation
+- Source: See feature catalog