Pick qemu-system-aarch64, the AArch64 UEFI firmware and a per-architecture QEMU config (NVMe disk, virtio-net, ramfb, USB installation media) on arm64, render the answer file for the target architecture, and move the q35-only disk and NIC devices out of the shared config. Update vm-images to match arm64 Windows ISO names. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>