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* Add ESP32 Power Management lessons learned document Documents our experimentation with ESP-IDF DFS and why it doesn't work well for Meshtastic (RTOS locks, BLE locks, USB issues). Proposes simpler alternative: manual setCpuFrequencyMhz() control with explicit triggers for when to go fast vs slow. * Added a lambda function to clear startup output in the MQTT unit test to ensure a clean state before and after the MQTT subscription process.