- Introduced JetStream Desired State metalayer with a new reconciliation engine and added cancel‑move, evacuate, and metalayer rescue endpoints for safer stream moves, scaling, and disaster recovery.
- Added stream backup/restore v2 format, source stream recreation detection, persisted source indexing, and domain‑prefixed JS API support in system accounts.
- Updated defaults and performance: default max 1000 consumers per stream, sync optimizations for replicated streams, enabled raft delete range by default, leafnode no‑advertise fix, MQTT QoS1 pipelining, and faster durable source/mirror c...