zhuyongxin
376ad0c241
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.
20 lines
487 B
Markdown
20 lines
487 B
Markdown
# Decisions: rag-hybrid-search-rrf
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## Capability
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sm-flow + OpenSpec fallback; apply pre-authorized.
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## Depends
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Delivery 1 archived.
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## Grill (compressed, pre-authorized)
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- Q: Full BM25 schema now? A: No — sparse-lite + RRF first; schema rebuild follow-up.
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- Q: Default mode? A: dense default; hybrid opt-in.
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- Q: Threshold score? A: keep dense-compatible L2 mapping.
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## Design
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Hybrid paths: dense unfiltered + dense filtered + lexical rank over union; RRF fuse by evidenceKey.
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