# 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