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Long-running cron jobs need lock files

Cron-triggered scripts that run longer than the cron interval will overlap, causing concurrent instances to compete for the same files. Add a lock file check at the top of the script.

Without a lock file, a second cron invocation starts while the first is still running. Both instances process the same files, leading to race conditions and corrupted state. Discovered during FileBot deployment (2026-03-10).

Affected entities:FileBot