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- Extract deploy.Run's snapshot -> apply -> restart -> health-check ->
rollback-on-failure sequence into deploy.GuardedApply, shared with
cmd/skiff's applyConfigChange, which duplicated it verbatim.
- Clean up the worktree and snapshot a deploy creates when it fails
before cutover (e.g. a failing release-phase migration), so retrying
the same sha no longer needs manual cleanup.
- Make checkout and snapshotting idempotent for a same-sha retry after
a cutover that later got rolled back on a failed health check, where
the release dir and snapshot are deliberately left behind by design.
- Document the actual cause of a jail not surviving a host reboot:
FreeBSD ships no /etc/jail.conf, so boot-time `service jail start`
finds nothing to start regardless of jail.conf.d - only name-targeted
starts read jail.conf.d directly, which is why manual starts worked.
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- Add layout.Config methods (ReleasesDir, PostReceiveHookPath, RCScriptPath,
RCConfPath) so main.go and jailmgr no longer hand-build paths that layout
already owns.
- Extract zfsutil.snapRef to replace three inline dataset@tag Sprintfs.
- Remove seven unused exported functions (zfsutil.Exists, jailmgr.Stop,
sh.RunWithStdinFile, and four dead layout.Config path methods) and their
now-unused imports.
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