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docs/features/checked/zastava/runtime-posture-evaluation.md

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+# Runtime Posture Evaluation
+
+## Module
+Zastava
+
+## Status
+IMPLEMENTED
+
+## Description
+Runtime posture evaluator that assesses the security posture of running containers with caching support.
+
+## Implementation Details
+- **IRuntimePostureEvaluator interface**: `src/Zastava/StellaOps.Zastava.Observer/Posture/IRuntimePostureEvaluator.cs` -- evaluates runtime security posture of containers
+- **RuntimePostureEvaluator**: `src/Zastava/StellaOps.Zastava.Observer/Posture/RuntimePostureEvaluator.cs` -- default posture evaluation implementation
+- **RuntimePostureEvaluationResult**: `src/Zastava/StellaOps.Zastava.Observer/Posture/RuntimePostureEvaluationResult.cs` -- evaluation result model
+- **IRuntimePostureCache**: `src/Zastava/StellaOps.Zastava.Observer/Posture/IRuntimePostureCache.cs` -- caching interface for posture evaluations
+- **RuntimePostureCache**: `src/Zastava/StellaOps.Zastava.Observer/Posture/RuntimePostureCache.cs` -- in-memory cache for posture results
+- **RuntimePostureCacheEntry**: `src/Zastava/StellaOps.Zastava.Observer/Posture/RuntimePostureCacheEntry.cs` -- cache entry model
+- **IRuntimePolicyClient**: `src/Zastava/StellaOps.Zastava.Observer/Backend/IRuntimePolicyClient.cs` -- client for runtime policy evaluation backend
+- **RuntimePolicyClient**: `src/Zastava/StellaOps.Zastava.Observer/Backend/RuntimePolicyClient.cs` -- runtime policy client implementation
+- **Tests**: `src/Zastava/__Tests/StellaOps.Zastava.Observer.Tests/Posture/RuntimePostureEvaluatorTests.cs`
+- **Source**: Feature matrix scan
+
+## E2E Test Plan
+- [ ] Verify posture evaluator assesses container security state from runtime facts
+- [ ] Test posture cache returns cached results for repeated evaluations within TTL
+- [ ] Verify posture evaluation integrates with runtime policy backend
+- [ ] Test cache invalidation on container state change
+- [ ] Verify evaluation results include posture score and risk indicators