show_only_when_running hid wrolpi-upgrade the moment it exited — exactly
when its logs matter after a failed upgrade — and hid wrolpi-api-dev
whenever it was stopped. Reinterpret the flag: hide a service only when
its unit is not installed on the box (LoadState=not-found). Discovery
now unions loaded units (--all, catching transient and exited units)
with installed unit files, and discovered services are listed regardless
of running state.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>