semi implemented and features implemented save checkpoint

docs/features/unchecked/policy/auditable-exception-objects.md

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+# Auditable Exception Objects
+
+## Module
+Policy
+
+## Status
+IMPLEMENTED
+
+## Description
+Exception objects with full audit trail including creation, approval, application, expiry, and revocation events. Supports evidence-linked approval workflows and audit-grade persistence.
+
+## Implementation Details
+- **Exception Library**: `src/Policy/__Libraries/StellaOps.Policy.Exceptions/` -- core exception system
+  - `Models/` -- exception domain models (ExceptionRecord, ExceptionApproval, etc.)
+  - `Services/` -- exception services (ExceptionService, ExceptionApprovalService)
+  - `Repositories/` -- exception persistence (IExceptionRepository)
+- **Exception Adapter**: `src/Policy/StellaOps.Policy.Engine/Adapters/ExceptionAdapter.cs` -- adapts exceptions for policy evaluation
+  - `ExceptionEffectRegistry.cs` -- tracks effects of applied exceptions
+- **Exception Domain**: `src/Policy/StellaOps.Policy.Engine/Domain/ExceptionContracts.cs` -- exception contracts
+  - `ExceptionMapper.cs` -- maps between exception models
+- **Exception Cache**: `src/Policy/StellaOps.Policy.Engine/ExceptionCache/` -- exception caching
+  - `ExceptionCacheModels.cs`, `IExceptionEffectiveCache.cs`, `MessagingExceptionEffectiveCache.cs`, `RedisExceptionEffectiveCache.cs`
+- **Exception Events**: `src/Policy/StellaOps.Policy.Engine/Events/ExceptionEventPublisher.cs` -- publishes exception lifecycle events
+- **Lifecycle Workers**: `src/Policy/StellaOps.Policy.Engine/Workers/ExceptionLifecycleService.cs`, `ExceptionLifecycleWorker.cs` -- background processing
+- **Approval Rules**: `src/Policy/StellaOps.Policy.Engine/Services/ExceptionApprovalRulesService.cs` -- approval workflow rules
+- **Exception-Aware Evaluation**: `src/Policy/StellaOps.Policy.Engine/Services/ExceptionAwareEvaluationService.cs` -- evaluation with exception awareness
+
+## E2E Test Plan
+- [ ] Create an exception object and verify audit trail records creation event
+- [ ] Approve an exception with evidence links and verify approval audit record
+- [ ] Apply an exception to a policy evaluation and verify it modifies the verdict
+- [ ] Let an exception expire and verify expiry event is recorded
+- [ ] Revoke an exception and verify revocation audit trail
+- [ ] Query exception history via API and verify all lifecycle events present
+- [ ] Verify exception cache invalidation on approval/revocation