Deliberate, never automatic. The autonomous gate it replaces recycled the
tunnel 652 times in 90 minutes and could not be switched off, because
'nmcli connection down' fired the dispatcher that brought it back up.
Reads NM for state rather than tracking a bool. No privilege needed: polkit
already lets the seat user activate a system connection. Registered in the
ii-phone chooser as well as ii-base, or the phone overlay wins and the
delegate never appears.
