Add orb and sun VMs with virtiofs swarm-common share

- Add orb (192.168.122.183) and sun (192.168.122.184) to inventory
- Create host_vars for orb and sun (fresh install, brew_packages: [])
- Add brew_packages to zap host_vars (gogcli, himalaya, kubernetes-cli, opencode)
- customize.yml: parameterize brew_packages via host_vars, add /mnt/swarm-common
  virtiofs+bindfs mount for all VMs, install bindfs, fix Homebrew install
- provision-vm.yml: remove become requirement; use virsh vol commands for all
  disk/image operations (no sudo needed)
- roles/vm/tasks/main.yml: rewrite disk provisioning to use virsh vol-create-as
  and vol-upload; fix vol name quoting for names with spaces; use qcow2 backing
- domain.xml.j2: always include swarm-common virtiofs share; make main share
  conditional on vm_virtiofs_source/tag

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

ansible/roles/vm/templates/domain.xml.j2

@@ -84,7 +84,7 @@
       <target type='virtio' name='org.qemu.guest_agent.0'/>
     </channel>
 
-{% if vm_virtiofs_source and vm_virtiofs_tag %}
+{% if vm_virtiofs_source | default('') and vm_virtiofs_tag | default('') %}
     <!-- virtiofs host share -->
     <filesystem type='mount' accessmode='passthrough'>
       <driver type='virtiofs'/>
@@ -93,6 +93,13 @@
     </filesystem>
 {% endif %}
 
+    <!-- virtiofs swarm-common share -->
+    <filesystem type='mount' accessmode='passthrough'>
+      <driver type='virtiofs'/>
+      <source dir='/home/will/lab/swarm/swarm-common'/>
+      <target dir='swarm-common'/>
+    </filesystem>
+
     <!-- TPM 2.0 -->
     <tpm model='tpm-crb'>
       <backend type='emulator' version='2.0'/>