Persistent process-lifetime HNSW index (engram_vindex) over resident node
embeddings, node_id == resident g->nodes[] index. Built lazily on first
activation, grown incrementally as appended nodes get embedded, rebuilt on
emb-dim change or resident-array shrink.
Seed selection queries the ANN for the nearest embedded nodes to the effective
query vector, replacing the O(K*N) exact argmax scan as the DISCOVERY step.
Each ANN candidate is admitted through the identical gate the exact scan uses
(exact cosine >= SEED_MIN via cosq, reached/dup skips, content dedup, same
decay/dampen shaping), so scoring/dynamics are unchanged. The exact argmax
scan is preserved verbatim and tops up any unfilled seed slot, and runs in
full when the index is empty/too-small/unavailable -> pre-M8 behaviour exactly.
cosq (O(N*dim) cosine fill) is intentionally retained: it still feeds the
propagation qgate and the Pass-2 WM term (activation dynamics, out of M8
scope). ANN accelerates SELECTION only.
will.anderson
1507614dbf