loginctl manages sessions/users/seats only — `loginctl poweroff` exits 1
"Unknown command verb". Preferring it silently broke poweroff/reboot/
suspend/hibernate from every shell surface. Use systemctl; fall back to
loginctl only on elogind systems where it does carry power verbs. The
logind D-Bus capability probe (CanPowerOff etc.) is unchanged — logind
owns policy, systemctl carries out the action.
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