feat: Nomarchy ground-up rewrite on NixOS 26.05

Full replacement of the previous iteration, rebuilt around three ideas:

- Pure evaluation: theme-state.json lives inside the flake and is read
  via the nomarchy.stateFile option — no --impure, ever.
- All-Home-Manager theming: `nomarchy-theme-sync apply` writes the JSON
  and runs `home-manager switch`; every theme change is one atomic,
  rollbackable generation. Wallpaper (swww) is the sole runtime piece.
- Flat, downstream-first layout: modules/{nixos,home} with one
  options.nix each, exported as nixosModules/homeModules + overlay +
  flake template; system (nixos-rebuild) and desktop (home-manager
  switch) rebuild paths are fully split.

Ships 21 themes imported from the previous iteration (palettes,
wallpapers, btop themes, six whole-swap Waybar identities), Stylix for
the GTK/Qt/cursor long tail, a live ISO target with offline theme
switching, and docs/TESTING.md with the QEMU verification workflow.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

modules/home/default.nix

@@ -0,0 +1,36 @@
+# Nomarchy — Home Manager entry point.
+# Consume this via homeModules.nomarchy (flake.nix), which also pulls in
+# the stylix home module that stylix.nix configures.
+{ config, pkgs, ... }:
+
+{
+  imports = [
+    ./options.nix   # the nomarchy.* option surface
+    ./theme.nix     # ingests theme-state.json, owns the live-sync hooks
+    ./stylix.nix    # GTK/Qt/cursor/fonts from the same JSON
+    ./hyprland.nix
+    ./waybar.nix
+    ./ghostty.nix
+    ./btop.nix
+  ];
+
+  home.stateVersion = "26.05";
+
+  home.packages = with pkgs; [
+    swww       # wallpaper daemon with animated transitions
+    fuzzel     # launcher / dmenu (used by the theme picker bind)
+    libnotify
+  ];
+
+  home.sessionVariables = {
+    TERMINAL = config.nomarchy.terminal;
+    NIXOS_OZONE_WL = "1"; # Electron/Chromium native Wayland
+
+    # Where the Nomarchy flake (and therefore theme-state.json) lives on
+    # disk. nomarchy-theme-sync writes its state here; rebuilds read from
+    # here. Clone/symlink your flake to this path.
+    NOMARCHY_PATH = "$HOME/.nomarchy";
+  };
+
+  programs.home-manager.enable = true;
+}