feat: graph-enhanced retrieval with PPR and community detection#395

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NevaMind-AI:mainfrom

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Commits on Apr 28, 2026

feat: add graph store module (Phase 1 of graph-enhanced retrieval PR)
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feat: integrate graph recall into retrieve pipeline (Phase 2)
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test: add 30 unit tests for graph store (Phase 3)
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fix: restore missing 002_add_relation_category migration file
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feat: add graph_store attribute to database interfaces and implementations
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feat: add scope filtering to graph store edge queries and community creation
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feat: add admission gate for memorize workflow with configurable quality filtering
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feat: add AdmissionGate class and tests (admission gate feature)
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fix(lint): resolve ruff errors in graph_store (C416/S311/E741/F841)
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chore: graph recall experiment + PR prep scripts
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perf(retrieve): cache category embeddings + lazy item pool (-88% latency)
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perf: remove dead category cache code, add repo-level list_items
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