Add 7-phase power profiling command (POWERTEST) that cycles through idle, CSI 10/100 Hz, BLE-only, combined, tx_low/tx_high with EVENT markers for external power meter correlation. Saves/restores all settings on completion. Update roadmap: mark v1.4 done, add v2.0 hardware upgrade milestone for ESP32-S3/C6 with WiFi FTM / 802.11mc inter-sensor ranging.