Deploy artifact. Sunday 04:00 local, Persistent=true so a
box that missed the wall-clock moment fires on next boot.
Timer + Service pair — both go under
~/.config/systemd/user/. The service is Type=oneshot; timer
drives it. Non-zero exit from cluster-scrub (integrity issue)
surfaces via systemd failed state; journalctl has the details.
README updated with install recipe.
