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Adds a fourth MultiVecIndex variant to ruvector-maxsim: a greedy kNN graph over per-document centroids + multi-seed beam search + exact MaxSim rerank. Complements the token-level HnswMaxSim with a one-node-per-document graph. Includes the consecutive-seeding correctness fix discovered in nightly PR #622: step-based beam seeding collapses recall when the step is a multiple of the cluster count. Documented in graph.rs and ADR-252. #622 produced a duplicate ruvector-maxsim crate (the name was already taken by #569, merged 2026-06-15); rather than merge the duplicate, its unique value is salvaged here. The public research gist from #622 remains published. - 5 new tests (recall vs Flat, dim validation, build/empty guards) — 23/23 pass - cargo fmt clean, cargo clippy -D warnings clean |
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