root 390ebf0c36 IVF_PQ recall tuned from 0.80 → 0.97 via parameter sweep
Systematic sweep of 8 IVF_PQ configs on 100K × 768d resumes.
num_sub_vectors is the dominant lever: 48 → 192 pushes recall
from 0.795 → 0.970. Winner: partitions=500, bits=8, subs=192.
Build 61s (vs 18s baseline), acceptable for background builds.

Hybrid status: HNSW recall=1.00 at <1ms, Lance IVF_PQ recall=0.97
at 60ms. Both backends production-grade.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
2026-04-16 22:08:34 -05:00
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