The recurring silent-freeze incidents on LXC 132 were rclone-rcd.service
getting OOM-killed under the original 1 GiB allocation, not a protondrive
backend quirk as first suspected. journalctl confirmed the OOM kill at the
exact freeze point. Bumped LXC memory to 2 GiB (live, no reboot) and the
full folder set (cloud/documents/repos) completed cleanly afterward.
Also documents two watchdog bugs found while chasing this: a wrong
stats-group key that made a healthy sync look falsely frozen, and a
blocking systemctl restart that caused the watchdog to silently disable
itself after firing once. Both fixed; watchdog kept as a safety net.