nx_recall_fuse.nx

nx_recall_fuse.nx -- hybrid rank fusion for the recall pipeline: RRF-combine the BM25 ranking and the dense (PPMI-SVD / nx_cosine) ranking into ONE fused order. module: nishi-core.search.recall_fuse depends: fx.nx, nx_rrf.nx, syscalls.nx capability: CORE_COMPUTE wired_status: LIBRARY (daemon wiring into dss_search_off_div = R1b, claims-coordinated) genealogy_id: cormack_clarke_buettcher_2009_rrf (two-signal hybrid fusion) WHY (debt-eating, good form): the live SERP ranks by BM25 (+PageRank) ONLY -- the dense-kNN / PPMI-SVD embeddings and nx_rrf are BUILT but UNWIRED into search. That is our own debt. This organ wires them: given the BM25 rank-order and the dense rank-order over a shortlist, it produces the RRF-fused order. It is built + gated + MEASURED on the nx_ir_eval ruler OFFLINE first (no crown-jewel docportal edit until the serve path is claims-clear), so the lift is a number, not a promise.