Joseph Doherty 95cf20b00b feat(mqtt): implement CONNECT/CONNACK/DISCONNECT packet handlers ...

Implement Task 3 of MQTT orchestration:
- Create MqttPacketHandlers.cs with ParseConnect(), ProcessConnect(), EnqueueConnAck(), HandleDisconnect()
- Wire CONNECT and DISCONNECT dispatch in MqttParser.cs
- Parse CONNECT: protocol name/level, flags, keep-alive, client ID, will, auth
- Send CONNACK (4-byte fixed packet with return code)
- DISCONNECT clears will message and closes connection cleanly
- Auto-generate client ID for empty ID + clean session
- Validate reserved bit, will flags, username/password consistency
- Add Reader field to MqttHandler for per-connection parsing
- 11 unit tests for CONNECT parsing and processing
- 1 end-to-end integration test: TCP → CONNECT → CONNACK over the wire

2026-03-01 15:48:22 -05:00

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