Credentials were seeded only when the container's copy was MISSING. So when a
session expired, the file still existed, the copy was skipped, and restarting
changed nothing -- the one recovery path a human has, re-logging in on the host,
could not reach the containers at all.
Now re-seeds whenever the host's copy is newer. Newer-wins rather than
always-copy, because a container refreshes its own token mid-run and that copy
may legitimately be the fresher of the two.
Found when both sessions expired: host credentials at 16:30, containers holding
14:20 and 14:24.
0cceaaf4a9