feat: make VM and live ISO match an installed Nomarchy

- Migrate VM and graphical ISO to home-manager.nixosModules.home-manager;
  drop the standalone-HM sudo-based activation script (ran HM against
  /root because HOME wasn't reset) in flake.nix, core/system/vm-guest.nix,
  hosts/live-iso.nix.
- Run swaybg as nomarchy-wallpaper.service instead of a silent Hyprland
  exec-once so failures surface in systemctl.
- Skip the battery monitor unit on hosts without /sys/class/power_supply/BAT*
  (VMs, desktops).
- Don't wrap walker --dmenu in uwsm-app; redirect setsid background std-fds
  in nomarchy-launch-walker so $(menu ...) in nomarchy-menu doesn't hang.
- Restart waybar/walker via systemctl --user rather than pkill + uwsm-app
  to stop the post-theme-switch color race.
- Wire nomarchy-restart-walker/-waybar into nomarchy-theme-set so themes
  that only change the imported CSS reload correctly.
- Waybar: pin #custom-nomarchy to the Nomarchy font and use the U+F000
  codepoint so the logo shows across all themes.
- Auto-install the correct icon-theme package per palette via a new
  nomarchyLib.iconThemePackage helper in lib/default.nix; Everforest now
  actually renders for summer-night.
- Pre-cache every theme's HM generation: new packages.allThemeVariants
  flake output and nomarchy-themes-prebuild script so theme switches are
  cache-only (no Stylix rebuild, no downloads).
- Add nomarchy-test-live-iso to boot the graphical ISO in QEMU the same
  way nomarchy-test-vm does, with virtio-gpu support added to live-iso.nix.
- Installer-generated home.nix/system.nix now ship a curated, commented
  app menu (btop/fastfetch/chromium on by default) plus optional system
  services (Docker, libvirtd, Tailscale, Syncthing, Flatpak, Steam).
- nomarchy-test-vm now wipes the stale nomarchy.qcow2 before launch.
- Remove obsolete GEMINI.md and PLAN.md.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

core/home/config/nomarchy/default/hypr/autostart.conf

@@ -2,7 +2,8 @@ exec-once = uwsm-app -- hypridle
 exec-once = uwsm-app -- mako
 # exec-once = uwsm-app -- waybar
 exec-once = uwsm-app -- fcitx5 --disable notificationitem
-exec-once = uwsm-app -- swaybg -i ~/.config/nomarchy/current/background -m fill
+# swaybg is started as a systemd user service (nomarchy-wallpaper.service)
+# so failures surface in logs and the wallpaper survives Hyprland restarts.
 exec-once = uwsm-app -- swayosd-server
 exec-once = nomarchy-on-boot
 

core/system/vm-guest.nix

@@ -1,19 +1,10 @@
-{ inputs, lib, pkgs, homeActivationPackage ? null, ... }:
+{ inputs, lib, pkgs, ... }:
 
 {
-  # Pre-activate standalone home-manager if provided
-  system.activationScripts.home-manager-activate = lib.mkIf (homeActivationPackage != null) {
-    text = ''
-      USER_HOME="/home/nomarchy"
-      if [ ! -d "$USER_HOME" ]; then
-        mkdir -p "$USER_HOME"
-        chown nomarchy:users "$USER_HOME"
-      fi
-      # Run activation as the nomarchy user
-      ${pkgs.sudo}/bin/sudo -u nomarchy ${homeActivationPackage}/activate
-    '';
-    deps = [ "users" ];
-  };
+  # Home Manager activation is provided by the home-manager.nixosModules.home-manager
+  # module wired up in flake.nix. It runs as a systemd user service per user and
+  # deploys ~/.config/hypr, ~/.config/nomarchy, ~/.config/waybar, etc. before the
+  # graphical session starts.
 
   # Shared VM configuration
   virtualisation.vmVariant = {