Default brightness is ~5%; UART blink mode and green/red pulses mark OTA success or failure. Failed UART uploads skip ESP-NOW distribution.
Co-authored-by: Cursor <cursoragent@cursor.com>
Stop the main-loop digit demo so host-driven display persists; expose
clear/progress/digit modes with RGB and intensity via protobuf and goTool.
Co-authored-by: Cursor <cursoragent@cursor.com>