semi implemented and features implemented save checkpoint

docs/features/unchecked/graph/graph-query-and-search-api.md

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+# Graph Query and Search API
+
+## Module
+Graph
+
+## Status
+IMPLEMENTED
+
+## Description
+Graph API with query, search, and path services for traversing and querying dependency graphs.
+
+## Implementation Details
+- **Query service**: `src/Graph/StellaOps.Graph.Api/Services/IGraphQueryService.cs`, `InMemoryGraphQueryService.cs` -- graph node/edge query with filtering
+- **Search service**: `src/Graph/StellaOps.Graph.Api/Services/IGraphSearchService.cs`, `InMemoryGraphSearchService.cs` -- full-text search across graph entities
+- **Path service**: `src/Graph/StellaOps.Graph.Api/Services/IGraphPathService.cs`, `InMemoryGraphPathService.cs` -- shortest-path and reachability path queries
+- **Repository**: `src/Graph/StellaOps.Graph.Api/Services/InMemoryGraphRepository.cs` -- in-memory graph data store
+- **Search contracts**: `src/Graph/StellaOps.Graph.Api/Contracts/SearchContracts.cs` -- search request/response DTOs
+- **Lineage contracts**: `src/Graph/StellaOps.Graph.Api/Contracts/LineageContracts.cs` -- lineage query contracts
+- **Reachability contracts**: `src/Graph/StellaOps.Graph.Api/Contracts/ReachabilityContracts.cs` -- reachability query contracts
+- **Rate limiting**: `src/Graph/StellaOps.Graph.Api/Services/RateLimiterService.cs` -- query rate limiting
+- **Tests**: `src/Graph/__Tests/StellaOps.Graph.Api.Tests/QueryServiceTests.cs`, `SearchServiceTests.cs`, `PathServiceTests.cs`, `RateLimiterServiceTests.cs`
+- **Source**: Feature matrix scan
+
+## E2E Test Plan
+- [ ] Verify query API returns nodes and edges matching filter criteria
+- [ ] Test full-text search returns ranked results across graph entities
+- [ ] Verify path queries find shortest paths between nodes
+- [ ] Test rate limiting prevents query abuse
+- [ ] Verify search contracts handle empty results and pagination