nx_vec_nsw.nx

nx_vec_nsw.nx -- R-VEC-3 of the onsite-search S-class ladder: SOVEREIGN approximate-nearest-neighbor INDEX via a Navigable Small World proximity graph (LIBRARY). "Illustration of the multi-layered search process of a Hierarchical Navigable Small World graph" (cited srch_hnsw.raw) -- this builds the SINGLE-LAYER NSW core (the base HNSW stacks into layers); an ANN search "is allowed to return points whose distance is at most c*d" (cited srch_ann.raw) for huge speedups over brute force. Reuses R-VEC-0 vr_cos_milli for distance (higher cosine = nearer). HONEST SCOPE: single-layer NSW + ef-beam greedy search; hierarchical layers = the named HNSW extension. Sub-linear because search only walks the graph neighborhood, not all N vectors. exports: vr_nsw_build, vr_nsw_search. license_tier: ORIGINAL