feat(distro): rename ISO targets and fix UEFI boot in live test script

- Rename installerIso and installerIsoGraphical to nomarchy-installer and nomarchy-live.
- Update host configurations with proper Nomarchy branding and volume IDs.
- Fix nomarchy-test-live-iso QEMU launch by using -drive if=pflash for UEFI firmware.
- Add nomarchy-build-live-iso utility script.
- Scrub remaining Omarchy references in Plymouth, installer messages, and docs.
- Regenerate docs/SCRIPTS.md to reflect new and renamed utilities.

hosts/nomarchy-live.nix

@@ -0,0 +1,80 @@
+{ config, pkgs, inputs, lib, ... }:
+
+{
+  # Live-ISO defaults. The install.sh keymap step calls `hyprctl keyword
+  # input:kb_layout` at runtime so the user's pick takes effect during the
+  # install, and writes the chosen value into the *installed* system.
+  console.keyMap = lib.mkDefault "us";
+  i18n.defaultLocale = lib.mkDefault "en_US.UTF-8";
+  services.xserver.xkb.layout = lib.mkDefault "us";
+
+  # ISO Branding
+  isoImage.volumeID = lib.mkForce "NOMARCHY_LIVE";
+  isoImage.edition = lib.mkForce "graphical";
+
+  # Home Manager activation for the nixos live user is provided by the
+  # home-manager.nixosModules.home-manager module wired up in flake.nix.
+
+  environment.systemPackages = with pkgs; [
+    git
+    gum
+    alacritty
+    parted
+    btrfs-progs
+    cryptsetup
+    inputs.disko.packages.${pkgs.stdenv.hostPlatform.system}.disko
+    (pkgs.makeDesktopItem {
+      name = "install-nomarchy";
+      desktopName = "Install Nomarchy";
+      exec = "alacritty -e sudo /etc/install.sh";
+      terminal = false;
+      categories = [ "System" ];
+    })
+  ];
+
+  # Ensure the live environment user has the necessary groups for graphical acceleration and audio
+  users.users.nixos.extraGroups = [ "wheel" "video" "render" "audio" "networkmanager" ];
+
+  # Graphics support for live environment.
+  #
+  # Force-loading every GPU driver in the initrd (amdgpu+radeon+nouveau+i915)
+  # panics most machines — only one of them can claim the GPU and the others
+  # explode. List them under `availableKernelModules` instead so udev only
+  # loads the one that matches the present hardware. We still force the AMD
+  # pair when Plymouth needs KMS early; `virtio_gpu` is auto-loaded when
+  # we're booted in QEMU via nomarchy-test-live-iso.
+  boot.initrd.availableKernelModules = [
+    "amdgpu" "radeon" "nouveau" "i915" "virtio_gpu"
+  ];
+  services.xserver.videoDrivers = [ "amdgpu" "radeon" "nouveau" "modesetting" "fbdev" "virtio" ];
+
+  environment.etc."install.sh" = {
+    source = ../installer/install.sh;
+    mode = "0755";
+  };
+
+  environment.etc."hardware-db.sh" = {
+    source = ../installer/hardware-db.sh;
+    mode = "0644";
+  };
+
+  environment.etc."disko-golden.nix" = {
+    source = ../installer/disko-golden.nix;
+  };
+
+  environment.etc."nomarchy".source = inputs.self;
+
+  # Override the upstream installer helpLine (says "NixOS", points nowhere
+  # useful for us). Shown on every TTY before login and again as the MOTD.
+  services.getty.helpLine = lib.mkForce ''
+
+    Welcome to the Nomarchy live environment.
+
+    To install Nomarchy:        sudo /etc/install.sh
+    To preview the install:     sudo /etc/install.sh --dry-run
+    To resume an interrupted run: sudo /etc/install.sh --resume
+
+    The graphical session autologins as 'nixos' (no password).
+    The 'nixos' and 'root' accounts have empty passwords.
+  '';
+}