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Joseph Doherty 11e01b9026 perf: optimize MQTT cross-protocol path (0.30x → 0.78x Go)

Replace per-message async fire-and-forget with direct-buffer write loop
mirroring NatsClient pattern: SpinLock-guarded buffer append, double-
buffer swap, single WriteAsync per batch.

- MqttConnection: add _directBuf/_writeBuf + RunMqttWriteLoopAsync
- MqttConnection: add EnqueuePublishNoFlush (zero-alloc PUBLISH format)
- MqttPacketWriter: add WritePublishTo(Span<byte>) + MeasurePublish
- MqttTopicMapper: add NatsToMqttBytes with bounded ConcurrentDictionary
- MqttNatsClientAdapter: synchronous SendMessageNoFlush + SignalFlush
- Skip FlushAsync on plain TCP sockets (TCP auto-flushes)

2026-03-13 14:25:13 -04:00

NATS.E2E.Cluster.Tests

feat: add JetStream cluster replication and leaf node solicited reconnect

2026-03-13 01:02:00 -04:00

NATS.E2E.Tests

test: skip superseded MQTT e2e cases

2026-03-13 11:50:01 -04:00

NATS.Server.Auth.Tests

perf: batch flush signaling and fetch path optimizations (Round 6)

2026-03-13 09:35:57 -04:00

NATS.Server.Benchmark.Tests

perf: optimize MQTT cross-protocol path (0.30x → 0.78x Go)