Centralize protobuf decode, response init/send, registration, and common nanopb encode callbacks; refactor existing cmd_* modules to use them. Co-authored-by: Cursor <cursoragent@cursor.com>
Register slaves from recv src_addr instead of protobuf mac bytes, add ESPNOW_UNICAST_TEST for path verification, restore unicast deadzone, and expose unicast-test in goTool. Co-authored-by: Cursor <cursoragent@cursor.com>
