Use virtio-net and virtio-gpu on arm64 again

The base image now carries the VirtIO drivers, which restores the 2304x1440
display that ramfb had lost.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

qemu/windows11/darwin-arm64.ini

@@ -19,15 +19,20 @@
   serial = "win11disk"
   bootindex = "1"
 
-# Windows has no inbox driver for virtio-net or virtio-gpu, and the base image
-# contains no VirtIO drivers, so the network card is an Intel e1000e and the
-# display is ramfb (a fixed-size framebuffer).
+# The base image carries the VirtIO drivers (build-windows-base.sh installs them
+# from the virtio-win ISO), so the VM uses virtio-net and virtio-gpu. virtio-gpu
+# is the only display, driven by viogpudo; ramfb is not added because Windows
+# would then see a second adapter with a fixed-mode monitor. xres/yres set the
+# preferred mode in the EDID (QEMU defaults to 1280x800); viogpudo accepted
+# 1920x1200, 2048x1280 and 2304x1440 but not 2560x1440 or 2560x1600.
 [device "nic0"]
-  driver = "e1000e"
+  driver = "virtio-net-pci"
   netdev = "net0"
 
 [device "gpu0"]
-  driver = "ramfb"
+  driver = "virtio-gpu-pci"
+  xres = "2304"
+  yres = "1440"
 
 [device "kbd0"]
   driver = "usb-kbd"