weighted_fuse

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1. 2d
   kb replaces default RRF fusion with weighted hybrid retrieval

   The kb project developer says relevant cross-language documents were being retrieved by vector search but then eliminated when BGE-M3 and BM25 results were merged with Reciprocal Rank Fusion. The default hybrid path was changed to weighted_fuse, which normalizes each list and divides by the number of retrieval methods that actually returned a document; relevance thresholds, larger candidate pools, and regression tests were also added. The developer retained RRF for comparisons and explicitly noted that no large-scale benchmark was run.

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