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Install snapshot and live-update hooks before mkinitcpio removal, migrate legacy paths, and cover the ordering invariant.
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archsetup took sanoid from install-archzfs but never ported the pre-pacman snapshot hook, so a ZFS-root install had no transaction-triggered rollback point — the working setup only existed as a hand-placed script on velox, lost on reinstall. Add configure_pre_pacman_snapshots(): a PreTransaction pacman hook plus a self-pruning script that keeps the 10 most recent pre-pacman snapshots (sanoid ignores them — they aren't autosnap_ names). It's gated to ZFS-root and runs late in boot_ux, so the hook doesn't fire during the install's own package operations and the first snapshot is the fresh system.
The script ships as scripts/zfs-pre-snapshot, made ZFS_PRE_* env-overridable so the pruning logic is unit-testable. Unit tests drive it against a fake zfs (creates a snapshot, prunes the oldest past KEEP, ignores non-pre-pacman snapshots, honors the lockfile interval, warns on failure); a Testinfra test asserts the hook and script land on a ZFS install; the orchestrator test pins the new boot_ux substep.
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The pre-pacman snapshot script accumulated 53 unpruned snapshots on velox since April — nothing prunes them, and Sanoid ignores the non-autosnap_ names. The fix is a self-pruning script (KEEP=10), but the home handoff confirmed the live script isn't archsetup-authored (it's hand-placed on velox), so incorporating it is a net-new ZFS-root installer step rather than a patch to an existing one. Filed as a [#B] feature with the design notes and the script preserved in docs/design, since it still needs the trigger hook file and a ZFS-root VM test before it can land.
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