YantrikDB

v0.6.5 — public insert_vector + encrypt_embedding_pub for piecewise HNSW backfill

Promotes two methods from pub(crate) to pub:

• pub fn insert_vector(&self, rid, embedding): wraps vec_index.write().insert
• pub fn encrypt_embedding_pub(&self, blob): wraps the existing pub(crate) encrypt_embedding

RFC 022 §2 (yantrikos/yantrikdb-server). Server's replication followers
now do per-row HNSW insert in backfill instead of full rebuild_vec_index
at the end of every batch. Drops follower recall lag from
minutes-to-hours to seconds, and starts working for encrypted clusters
for the first time (was 100% broken because encrypt_embedding was pub(crate)).

Empirical motivation: 2026-05-01 cross-lane skill_recall/skill_get bug,
diagnosed via 90-second test against live cluster — leader is already
RYW-consistent; follower-side full rebuild was the actual lag source.

Purely additive API. 1319 tests pass. No behavior change for existing
callers. Composable with v0.6.4 read connection pool.