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
parent ac1f831903
commit 376ad0c241
19 changed files with 661 additions and 8 deletions
@@ -0,0 +1,3 @@
+committed: 2026-07-27
+change: rag-hybrid-search-rrf
+authorized-apply: user-preauthorized-sm-flow