Split ESP-NOW into core/master/slave modules, block non-OTA UART traffic during updates, and hold the host serial port exclusively so dashboard polling cannot interleave with firmware uploads.
Co-authored-by: Cursor <cursoragent@cursor.com>
Document UART command flow, ESP-NOW data paths, and module map for
developers without covering goTool; link from main/README.
Co-authored-by: Cursor <cursoragent@cursor.com>
