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Each of these steps misbehaves on a resume re-run or under unexpected system state, so I pulled the logic into small testable helpers and fixed the behavior.
The log-cleanup cron line was appended unconditionally. essential_services is one resume step, so a failure past that point plus a re-run stacked a second identical cron line every time. crontab_append_once now appends only when no existing line matches.
The weekly ZFS scrub timer used `zpool list | head -1`, which picks an arbitrary pool when several exist and builds the malformed unit `zfs-scrub-weekly@.timer` when none do. zfs_scrub_timer_units emits one timer per pool and nothing for no pools, so every pool is scrubbed and an absent pool warns instead of enabling a broken unit.
gamemode was enabled through `systemctl --user enable`, which the script itself documents fails at install time with no user session bus -- so gamemoded was likely left un-enabled behind a silent warning. It now wires the wants symlink by hand through enable_user_service, the same helper syncthing's block folds into.
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