- Tests for send_command() v:1 injection, field preservation
- Tests for stop/brightness commands, pre-connection silent drop
- Tests for 512-byte payload limit enforcement
- Tests for STATUS ok response → connected=True + last_status
- Tests for malformed JSON silent handling, on_status callback
- Tests for send_status_ping, connection_lost, create_esp32_transport factory
- Tests for led_sync.transport package re-exports
