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docs/features/checked/zastava/verdict-observer-validator-ledger.md

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+# Verdict Observer/Validator/Ledger
+
+## Module
+Zastava
+
+## Status
+IMPLEMENTED
+
+## Description
+Verdict subsystem with observer, validator, and ledger interfaces for tracking security verdicts at runtime.
+
+## Implementation Details
+- **IVerdictObserver interface**: `src/Zastava/__Libraries/StellaOps.Zastava.Core/Verdicts/IVerdictObserver.cs` -- observes and records verdict decisions
+- **IVerdictValidator interface**: `src/Zastava/__Libraries/StellaOps.Zastava.Core/Verdicts/IVerdictValidator.cs` -- validates verdict integrity and consistency
+- **IVerdictLedger interface**: `src/Zastava/__Libraries/StellaOps.Zastava.Core/Verdicts/IVerdictLedger.cs` -- append-only ledger for verdict history
+- **VerdictObserverContracts**: `src/Zastava/__Libraries/StellaOps.Zastava.Core/Verdicts/VerdictObserverContracts.cs` -- verdict DTOs and contract models
+- **AdmissionDecision**: `src/Zastava/__Libraries/StellaOps.Zastava.Core/Contracts/AdmissionDecision.cs` -- admission verdict decision model
+- **ZastavaContractVersions**: `src/Zastava/__Libraries/StellaOps.Zastava.Core/Contracts/ZastavaContractVersions.cs` -- contract versioning for verdict schemas
+- **Tests**: `src/Zastava/__Tests/StellaOps.Zastava.Core.Tests/Contracts/ZastavaContractVersionsTests.cs`
+- **Source**: Feature matrix scan
+
+## E2E Test Plan
+- [ ] Verify verdict observer records admission decisions with full context
+- [ ] Test verdict validator checks decision integrity (hash, signature, timestamp)
+- [ ] Verify verdict ledger provides append-only history with immutable entries
+- [ ] Test contract versioning handles schema evolution
+- [ ] Verify verdict chain maintains consistency across observer restarts