v0.9.4

Sync-position correctness + CLI hardening. Consolidate five scattered sync cursors into one typed syncPosition (persisted/applied/acked with a derived readFloor), fixing a claim taken right after an ack-confirmed write reading stale against that write’s own delta. Add transaction ack-confirmation, schema DDL-first-push, and a reworked CLI (config/dev/login/mode/drizzle-pull).