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.

features/scripts/utils/nomarchy-test-live-iso

@@ -1,14 +1,14 @@
 #!/usr/bin/env bash
 
 # Build the Nomarchy graphical live ISO and boot it in QEMU for a
-# try-before-install experience. The ISO is the `installerIsoGraphical`
-# NixOS configuration — same Nomarchy system + Home Manager stack as
+# try-before-install experience. The ISO is the `nomarchy-live`
+# NixOS configuration - same Nomarchy system + Home Manager stack as
 # `nomarchy-test-vm`, just wrapped in an installable live medium.
 
 set -e
 
 echo "Building Nomarchy Live ISO..."
-nix build .#nixosConfigurations.installerIsoGraphical.config.system.build.isoImage
+nix build .#nixosConfigurations.nomarchy-live.config.system.build.isoImage
 
 ISO=$(ls -1 result/iso/*.iso 2>/dev/null | head -n 1)
 if [ -z "$ISO" ]; then
@@ -22,11 +22,19 @@ OVMF_CANDIDATES=(
     "/run/current-system/sw/share/OVMF/OVMF_CODE.fd"
     "/run/current-system/sw/share/qemu/edk2-x86_64-code.fd"
     "/nix/var/nix/profiles/system/sw/share/OVMF/OVMF_CODE.fd"
+    "/usr/share/OVMF/OVMF_CODE.fd"
 )
 BIOS_ARG=()
 for c in "${OVMF_CANDIDATES[@]}"; do
     if [ -f "$c" ]; then
-        BIOS_ARG=(-bios "$c")
+        # Use pflash for UEFI firmware. -bios is for legacy BIOS.
+        BIOS_ARG=(-drive "if=pflash,format=raw,readonly=on,file=$c")
+
+        # Optional: Add matching VARS file if it exists.
+        VARS="${c%_CODE.fd}_VARS.fd"
+        if [ -f "$VARS" ]; then
+            BIOS_ARG+=(-drive "if=pflash,format=raw,readonly=on,file=$VARS")
+        fi
         break
     fi
 done