100 queries after 20 warm-up, topK=10, cosine, each store's library defaults
store           recall@10    p50 ms    p95 ms  mean hits
pgvector            0.951       9.5      16.4       10.0
redis               0.616       0.7       1.1       10.0
qdrant              0.999       2.8       6.8       10.0
elasticsearch       0.491       5.4      20.5       10.0
