ArduinoOTA enables wireless firmware uploads (pio run -e tdeck-ota -t upload).
UDP log callback via RNS::setLogCallback sends all log lines plus Serial.printf
diagnostics to multicast group 239.0.99.99:9999 for untethered monitoring.
Includes safety guards: UDP suspended during WiFi transitions, reentrancy
protection, and WiFi status check before each send.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
