feat(search): hybrid BM25 + vector ranking via RRF (promote lexical to first-class)#443

Merged

HumanBean17 merged 15 commits into

worktree-hybrid-bm25-rrf-431

Jul 12, 2026

Commits on Jul 11, 2026

docs(spec): hybrid BM25 + vector RRF design (issue #431, fork B)

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docs(plan): hybrid BM25 + vector RRF implementation plan (issue #431)

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refactor(scoring): derive _HYBRID_SCORE_MAX RRF term from list count
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feat(search): injectable RankConfig for RRF list-set and k

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feat(scoring): surface bm25= token in hybrid explain output
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feat(search): fuse LadybugDB BM25 as third RRF list on vector path

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test(search): cover member-fqn dedup-by-max in _bm25_candidate_rows

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feat(eval): IR metrics — recall@k, precision@k, reciprocal rank, aggregate
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feat(eval): Tier-A auto ground-truth generator + Tier-B loader

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feat(eval): shopizer recall/precision@k + MRR runner with k-sweep

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fix(eval): timestamped results subdir + cleanups (dead code, public reset API)

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