Every other bluetoothctl call in the script is silenced and time-boxed;
the new power check was neither, so a wedged D-Bus could hang pair before
it reached its own timeout and spill dbus assertions onto stderr.
Cover both paths with a stubbed bluetoothctl: the power-on sequence is
skipped when the adapter reports Powered: yes, and still runs when it
does not.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
