- calamares: insert cosmic-greeter-start branch into DMgreetd.set_autologin
(anchored on the ddlm elif) so COSMIC+greetd installs launch the correct
greeter instead of falling back to agreety. pkgrel 7 -> 8.
- branding netinstall: add vulkan-nouveau so newer NVIDIA GPUs work via the
open NVK stack without nvidia-open. pkgrel bump not needed (netinstall only).