The fake Ente server holds the download of the first file open while the
test removes backup.lock, or puts another backup's lock in its place, and
fires proper-lockfile's timer on a faked clock. quak backup must then stop
before its next file and print one line, and lib.backup() must reject with
the reason. A backup whose lock stays must still run to the end. These fail
until the lock handles being lost.
Model: opus-5-5
sneak
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