Initial commit: Packer + QEMU/KVM Windows 11 minimal VM

Fully unattended Windows 11 Pro build using Autounattend.xml, swtpm
for TPM 2.0 emulation, and VirtIO drivers. Five PowerShell provisioners
strip bloatware, telemetry, unused services, and apply performance tuning
for a resource-constrained host. Output is a compressed QCOW2 image.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Makefile

@@ -0,0 +1,48 @@
+VIRTIO_VERSION := 0.1.266
+VIRTIO_ISO_URL := https://fedorapeople.org/groups/virt/virtio-win/direct-downloads/archive-virtio/virtio-win-$(VIRTIO_VERSION)-1/virtio-win-$(VIRTIO_VERSION).iso
+VIRTIO_ISO     := virtio-win.iso
+VAR_FILE       := variables.pkrvars.hcl
+
+.PHONY: all build init validate clean distclean help
+
+all: build
+
+## Install Packer QEMU plugin
+init:
+	packer init .
+
+## Download VirtIO drivers ISO (~500 MB, one-time)
+$(VIRTIO_ISO):
+	curl -L --progress-bar -o $(VIRTIO_ISO) $(VIRTIO_ISO_URL)
+
+virtio-iso: $(VIRTIO_ISO)
+
+## Validate the Packer template (does not run the build)
+validate: $(VIRTIO_ISO)
+	SWTPM_SOCK=/tmp/dummy-validate \
+	  packer validate -var "swtpm_sock=/tmp/dummy" -var-file=$(VAR_FILE) .
+
+## Build the VM image (starts swtpm, runs Packer, cleans up)
+build: init $(VIRTIO_ISO)
+	@test -f $(VAR_FILE) || { \
+	  echo "ERROR: $(VAR_FILE) not found."; \
+	  echo "       cp variables.pkrvars.hcl.example $(VAR_FILE) and fill it in."; \
+	  exit 1; }
+	bash build.sh $(VAR_FILE)
+
+## Remove build output (keeps downloaded ISOs)
+clean:
+	rm -rf output/
+
+## Remove build output and downloaded ISOs
+distclean: clean
+	rm -f $(VIRTIO_ISO)
+
+help:
+	@echo "Targets:"
+	@echo "  build      Build the VM image (default)"
+	@echo "  validate   Validate Packer config without building"
+	@echo "  init       Install Packer plugins"
+	@echo "  virtio-iso Download the VirtIO drivers ISO"
+	@echo "  clean      Remove build output"
+	@echo "  distclean  Remove build output + downloaded ISOs"