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Adds server/services/graph-db.js (new data/graph.sqlite: system_agents, org_graph_nodes, org_graph_edges) and graph-seed-service.js, which scans system/agents/, system/templates/, and data/companies/*/company.json into seed rows without touching company-service.js's existing hire/copy path. Real repo data diverged from the design doc's original estimates (8 not 10 global agents; 39 not 34 template dirs; system/agents/ and system/templates/ turn out to share 6 ids describing the "same" agent from two different files) — documented in docs/todo/system-design/27-graph-agent-architecture.md section 7 for P1/P2 to resolve. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>