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zhuyongxin 376ad0c241 feat(rag): hybrid multi-path search with RRF fusion 
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.
2026-07-27 18:33:31 +08:00

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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.

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