- Reduced memory usage and GC pressure for quorum and classic queues; optional CQv2 index/store and up to 100× faster definition import.
- Added quorum queue features: message TTL, selectable dead‑lettering strategies, safer requeue behavior, and support for durable MQTT QoS 1 subscriptions.
- Plugin and API enhancements including OAuth2 scope‑alias mapping, new "any‑with‑x" header exchange matcher, TLS‑aligned stream replication, and RFC 3339 timestamps for management API (breaking for existing clients).
