# 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