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feat(rag): hybrid multi-path search with RRF fusion

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Add configurable hybrid mode on KnowledgeSearchPort that fuses dense
unfiltered, dense filtered, and lexical ranks via RRF while preserving
dense-compatible threshold scores. Archives Delivery 2 OpenSpec change.
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zhuyongxin
2026-07-27 18:33:31 +08:00
parent ac1f831903
commit 376ad0c241
19 changed files with 661 additions and 8 deletions
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devflow/projects/2026-07-27-rag-hybrid-search-rrf/brief.md
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# Brief: rag-hybrid-search-rrf
Delivery 2 after chunk identity. Enable hybrid multi-path + RRF on KnowledgeSearchPort without legacy SDK hybrid API. True BM25 schema rebuild is staged follow-up; this change ships sparse-lite lexical ranking over dense candidate union + filtered/unfiltered dense fusion.