kvm2: integration test, sample Proxy, providers-config entries and Makefile target

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

config/manager/providers_config.yaml

@@ -51,4 +51,35 @@ data:
               bridge: br0                 # to a LAN with DHCP; the VM's IP comes from there
               # socket: /var/run/libvirt/libvirt-sock
               # pool: default
+      # kvm2 takes the same block shape as kvm: an entry ports by changing
+      # type to kvm2 and the block name to kvm2. kvm2 does not adopt domains
+      # made by kvm, so delete those Proxies first. See docs/kvm2-provider.md.
+      # - name: kvm2-home
+      #   type: kvm2
+      #   kvm2:
+      #     sshKeyFile: /etc/proxy-operator/kvm/id_ed25519
+      #     knownHostsFile: /etc/proxy-operator/kvm/known_hosts
+      #     # insecureIgnoreHostKey: true
+      #     # diskSizeGb: 10
+      #     # installGuestAgent: false
+      #     # vendorData: |
+      #     #   #cloud-config
+      #     #   ...
+      #     images:
+      #       debian-13:
+      #         url: https://cloud.debian.org/images/cloud/trixie/latest/debian-13-generic-amd64.qcow2
+      #         # sha256: "<64 hex>"
+      #         # firmware: uefi
+      #       ubuntu-24.04:
+      #         url: https://cloud-images.ubuntu.com/noble/current/noble-server-cloudimg-amd64.img
+      #     machineTypes:
+      #       small:  {vcpus: 1, memoryMiB: 1024}
+      #       medium: {vcpus: 2, memoryMiB: 2048}
+      #     hosts:
+      #       - name: beelink
+      #         address: beelink.tail8c69c.ts.net:22
+      #         user: novakj
+      #         bridge: br0
+      #         # socket: /var/run/libvirt/libvirt-sock
+      #         # pool: default