Build the Omarchy appliance for UTM SE on iPad and iPhone

omarchy-utm-make runs builder/build-utm.sh in a privileged linux/arm64
container: a 32G sparse GPT disk with the ISO's Btrfs subvolume layout,
Arch Linux ARM plus the aarch64 Omarchy packages, Limine on the UEFI
fallback path, omarchy-apply-system --defer-provisioning in the chroot,
first-boot provisioning staged with the arm64 Node tarball, one
limine-update, then a sealed and checked disk converted to compressed
qcow2. The host wraps it as a .utm bundle (no serial device: iOS has no
Ptty mode), zips it, and writes a sha256. omarchy-utm-boot boots the
result under qemu's interpreter, the closest stand-in for UTM SE.

fstab is written from the partition UUIDs directly: genfstab named the
hand-made loop device nodes, which sent the first boot into emergency
mode.

Claude-Session: https://claude.ai/code/session_019krxFwnSbEM2n2QNQ1rG1K

builder/utm/render

@@ -0,0 +1,8 @@
+#!/bin/bash
+# Renders the UTM config.plist template: render <vm-uuid> <disk-uuid> <mac> <version>
+
+set -e
+
+(( $# == 4 )) || { echo "Usage: $0 <vm-uuid> <disk-uuid> <mac> <version>" >&2; exit 1; }
+
+sed -e "s/@@VM_UUID@@/$1/" -e "s/@@DISK_UUID@@/$2/g" -e "s/@@MAC@@/$3/" -e "s/@@VERSION@@/$4/" "$(dirname "$0")/config.plist"