`su -` runs through pam_systemd on Manjaro/Arch, creating a new login
session that conflicts with the outer sudo session and detaches the
install from the controlling terminal — making `sudo make install`
appear to end while it keeps running in the background. Replace `su`
calls with `runuser`, which is designed for root-invoked scripts and
skips PAM session management.
Also flips init.sh's non-root branch from `exit 0` (silent success) to
`exit 1` with a clear stderr message, so `make install` correctly fails
when invoked without root.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
* Centralize OS detection and normalization in a dedicated resolver module
* Treat Manjaro consistently as Arch across dependencies and package install
* Remove duplicated OS logic and legacy lib.sh
* Rename installation entrypoint to init.sh and update Makefile accordingly
https://chatgpt.com/share/693c7b50-3be0-800f-8aeb-daf3ee929ea3
