feat(db): add NeuG graph database as optional backend with native Cypher support#698

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colbymchenry:mainfrom

BingqingLyu:feat/neug-backend

Commits on Jun 5, 2026

feat(db): add NeuG graph database as optional storage backend

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feat(neug): complete NeuG backend API + add cypher CLI subcommand

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test(neug): add comprehensive test coverage for all QueryBuilder methods

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docs: add NeuG graph database backend documentation

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test(neug): add Cypher query verification tests for issue draft examples

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chore: migrate neug dependency from local tgz to published @graphscope-neug/neug

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feat(mcp): add codegraph_cypher tool for raw Cypher queries via MCP

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