Use TX=GPIO3 and RX=GPIO2 at 921600 to match the terminal adapter wiring;
log received message id and which handler command is triggered.
Co-authored-by: Cursor <cursoragent@cursor.com>
Centralize command dispatch over a FreeRTOS queue so UART and future
ESP-NOW transports can register handlers; implement the protobuf VERSION
command with framed nanopb responses including build git hash.
Co-authored-by: Cursor <cursoragent@cursor.com>
