JSON configs describe network and node MACs; scenarios run command
sequences with expect checks. Share UART client API across CLI and tests.
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>
