Pacman hooks are not executed in archiso builds, yet services appear enabled in the live ISO

When building a custom ISO using **archiso**, **pacman** `post_install` / `post_upgrade` hooks are not reliably executed (or are intentionally skipped), which is expected behavior because archiso builds a non-running filesystem and not a live system.

However, in the official CachyOS live ISO, several services (e.g. wireplumber) appears enabled at boot time, even though:

**pacman** hooks are not allowed / not effective in **archiso**

there are no pre-created symlinks under
`archiso/airootfs/etc/systemd/system/` or
`archiso/airootfs/etc/systemd/user/` in the repository

This creates confusion for users building custom ISOs, as it looks like **pacman** hooks were applied, even though they were not.

Would you mind providing details on how such services were enabled/links created for some services in Live ISO created via **archiso**?