CachyOS kernels

Install normally, then swap kernels after first boot. Keeps stock kernel as fallback.

1. Boot the installed system
2. Add CachyOS repos: git clone Cachyos-repos then run sudo ./cachyos-repo --install
3. pacman -Sy linux-cachyos (and any additional drivers you might need from their repos)
4. Regen bootloader: grub-mkconfig -o /boot/grub/grub.cfg (or equivalent depending on bootloader and paths)
5. Reboot, pick the new kernel entry in the menu.

Optionally after checking all works fine, remove the original kernel/headers and repos (--remove).