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save checkpoint. addition features and their state. check some ofthem

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# Graph Overlay System (Policy, VEX, Reachability)
## Module
Graph
## Status
VERIFIED
## Description
Overlay system with exporter, in-memory overlay service, and tests for layering policy/VEX/reachability data onto dependency graphs.
## Implementation Details
- **Overlay service interface**: `src/Graph/StellaOps.Graph.Api/Services/IOverlayService.cs` -- overlay query contract
- **In-memory overlay service**: `src/Graph/StellaOps.Graph.Api/Services/InMemoryOverlayService.cs` -- in-memory overlay implementation for testing
- **Overlay exporter**: `src/Graph/StellaOps.Graph.Indexer/Analytics/GraphOverlayExporter.cs` -- exports analytics results as overlay layers
- **Policy overlay processor**: `src/Graph/StellaOps.Graph.Indexer/Ingestion/Policy/PolicyOverlayProcessor.cs` -- ingests policy decisions as graph overlays
- **Policy overlay transformer**: `src/Graph/StellaOps.Graph.Indexer/Ingestion/Policy/PolicyOverlayTransformer.cs` -- transforms policy data for graph overlay
- **Policy overlay snapshot**: `src/Graph/StellaOps.Graph.Indexer/Ingestion/Policy/PolicyOverlaySnapshot.cs` -- policy overlay state
- **Policy overlay metrics**: `src/Graph/StellaOps.Graph.Indexer/Ingestion/Policy/PolicyOverlayMetrics.cs`, `IPolicyOverlayMetrics.cs` -- overlay processing metrics
- **VEX overlay**: `src/Graph/StellaOps.Graph.Indexer/Ingestion/Vex/VexOverlayTransformer.cs`, `VexOverlaySnapshot.cs` -- VEX verdict overlays on graph
- **Reachability delta**: `src/Graph/StellaOps.Graph.Api/Services/IReachabilityDeltaService.cs`, `InMemoryReachabilityDeltaService.cs` -- reachability annotation overlays
- **Tests**: `src/Graph/__Tests/StellaOps.Graph.Indexer.Tests/GraphOverlayExporterTests.cs`
- **Metrics tests**: `src/Graph/__Tests/StellaOps.Graph.Api.Tests/MetricsTests.cs` -- overlay cache counter verification
- **Source**: Feature matrix scan
## E2E Test Plan
- [x] Verify policy overlay renders policy decisions on graph nodes
- [x] Test VEX overlay annotates graph with VEX verdict data
- [x] Verify reachability overlay shows reachability status per edge
- [x] Test overlay exporter generates valid overlay from analytics results
- [x] Verify overlay stacking (multiple overlays on same graph)
## Verification
- **Run ID**: run-002
- **Date**: 2026-02-09T21:43:00Z
- **Tier**: 1 (Source + Build + Test)
- **Result**: PASS
- **Evidence**: 52/52 Graph.Api.Tests pass (including MetricsTests 2/2 pass for overlay cache counters). 108/108 non-persistence tests pass across all Graph test projects. 17 Persistence tests skipped (require Docker/PostgreSQL -- environment limitation, not a regression).
- **Notes**: Required 1 retry cycle. Initial failure due to MeterListener cross-contamination in MetricsTests -- name-based meter filtering picked up instruments from other tests' undisposed GraphMetrics instances. Fixed in run-002 by switching to instance-based meter filtering and adding `using` statements to GraphMetrics instances in QueryServiceTests.