pub const RRF_WEIGHT_VECTOR: f64 = 1.0;Expand description
G9 / IR-C — per-branch RRF weights. The sweep’s optimum is strongly
text-dominant (text:vector ≈ 3:1): the lexical (BM25) arm carries
exact-fact recall and the dense arm, over-weighted, is a net drag on
exploratory recall (performance-output-and-compare.md, 2026-06-10b/e). A
branch contributes weight / (RRF_K + rank).