Add modules.desktop.portals, enabled by the desktop aggregator, pinning the
XDG desktop portal routing explicitly: the three interfaces the Hyprland
portal implements (screencast, screenshot, global shortcuts) go to Hyprland,
and GTK is the default for file dialogs and appearance.
The backend packages already arrive with the Hyprland compositor integration,
so this module owns only the routing, which was previously empty and rode on
the config file the Hyprland package happens to ship. Making it a first-class
module so in-app screen sharing does not depend on that incidental default.
Add the hyprland-desktop spec, ADR 0003 recording the compositor choice
over Sway/KDE/niri, and the task breakdown (0021-0030) that decomposes
the desktop into granular grouped modules. Record the corrected host GPU
facts (zeus is AMD, raichu the sole Nvidia machine) in CLAUDE.md.
