unpackfs runs unsquashfs then rsync to copy the rootfs onto the target;
rsync was missing (error code 127), so add it alongside squashfs-tools.
unpackfs also copies the live filesystem verbatim, so the installed
system would inherit the archiso initramfs hooks (booting into the live
path) plus the live autologin/user/sudoers. Rework post-install.sh to run
in the target chroot as a resilient best-effort script that:
- removes the live autologin drop-in, bos-live-setup service/scripts and
the liveuser sudoers file, and locks root (sudo model; the live medium
left root passwordless),
- drops the archiso mkinitcpio config, installs the stock linux.preset and
regenerates the initramfs, then refreshes grub.cfg,
- keeps the snapper/services/dotfiles setup, with the network-dependent
bakery install made non-fatal so offline installs still complete.
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