refactor(graph): absorb Cartographer into graph-api + wire Graph Indexer
- Wire Graph Indexer library + Persistence into graph-api (csproj refs + DI)
- Add build/overlay endpoints matching Scheduler HTTP contracts
(POST/GET /api/graphs/builds, POST/GET /api/graphs/overlays)
- Add PostgresGraphRepository for reading from graph.graph_nodes/edges
- Register SBOM ingest, analytics, change-stream, and inspector pipelines
- Comment out Cartographer container in compose (empty shell, Slot 21)
- Add cartographer.stella-ops.local as backwards-compat alias on graph-api
- Update Scheduler config to target graph.stella-ops.local
- Update services-matrix.env, hosts file, port-registry, module-matrix
- Update component-map, architecture docs, Scanner/Graph READMEs
- Eliminates 1 container (stellaops-cartographer)
All 133 existing tests pass (77 Api + 37 Indexer + 19 Core).
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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