One capability per manager — uplink-networkmanager, uplink-systemd-networkd, uplink-dhcpcd — from systemctl is-active, so the uplink seat's holder for a manager this machine does not run is refused the way any missing capability is, naming it (issue 138). The apply that reports detects the profile again and sends it, the same shape enrolment sends, so a machine that switched managers reaches the mesh at its next push.