Completes OQ-ST-03: one driver posture (tokio-postgres + deadpool, the
POC #5/#7-validated stack) with three sub-modules — L (LISTEN plumbing:
dedicated connection, multi-channel, payload boundary), T (tx-seam over
the pool: caller-owned tx handle vs closure-scoped, both implemented
and compared — direct OQ-ST-04 input), W (wake-vs-poll parity, LISTEN
reconnect + the replay hole honesty). Property tests are the POC #1
suite's pg twin; seam probe mirrors the POC #1 workload for the
cross-engine relative claim. Gate: commit-atomicity via in-tx NOTIFY
(load-bearing), exactly-once claim, seam costs, LISTEN robustness -
failure names the sqlx PgListener fallback posture. Out of scope:
queue semantics depth (OQ-ST-05), pgboss-rs code adoption, multi-host
stress (OQ-ST-08). Register row added, plan updated (POC #2 running
closes OQ-ST-03).
glm-5.3-flash
e18281735e