bluez and bluez-utils, and bluetooth.service running and enabled. On both
workstations bluez is installed only as a dependency; declaring it keeps a
clean-up from taking it.
Nine Go tools over bluetoothctl: controller, power, devices with battery
where reported, a bounded scan, connect, disconnect, trust, pair (an agent
that confirms nothing, for headphones) and remove. An act whose output says
it failed is an error whatever the exit status, and one bluez refuses the
account is repeated through sudo -n.
