# Local Evidence Cache with Deferred Enrichment Queue

## Module
ExportCenter

## Status
IMPLEMENTED

## Description
Disk-backed local evidence cache that stores scan artifacts (SBOM, VEX, reachability data) alongside findings with a deferred enrichment queue pattern for offline-first evidence collection and lazy hydration.

## Implementation Details
- **Cache service interface**: `src/ExportCenter/StellaOps.ExportCenter/StellaOps.ExportCenter.Core/EvidenceCache/IEvidenceCacheService.cs` -- evidence cache contract
- **Cache service implementation**: `src/ExportCenter/StellaOps.ExportCenter/StellaOps.ExportCenter.Core/EvidenceCache/LocalEvidenceCacheService.cs` -- disk-backed local evidence cache with deferred enrichment queue
- **Cache models**: `src/ExportCenter/StellaOps.ExportCenter/StellaOps.ExportCenter.Core/EvidenceCache/CacheModels.cs` -- cache entry models for SBOM, VEX, reachability data
- **Cache manifest**: `src/ExportCenter/StellaOps.ExportCenter/StellaOps.ExportCenter.Core/EvidenceCache/CacheManifest.cs` -- cache manifest for inventory tracking
- **Tests**: `src/ExportCenter/StellaOps.ExportCenter/StellaOps.ExportCenter.Tests/EvidenceCache/LocalEvidenceCacheServiceTests.cs`
- **Source**: SPRINT_3605_0001_0001_local_evidence_cache.md

## E2E Test Plan
- [ ] Verify evidence cache stores SBOM, VEX, and reachability data to disk
- [ ] Test deferred enrichment queue processes entries lazily
- [ ] Verify cache manifest tracks all cached entries
- [ ] Test offline-first behavior (cache works without network)
- [ ] Verify cache eviction policy for disk space management