Scope Vagrant libvirt domains to allow multiple checkouts

Use a hash of the absolute working directory path to generate a unique
libvirt domain prefix per checkout, preventing collisions when multiple
clones or git worktrees deploy Vagrant boxes simultaneously.

Both the libvirt domain name prefix and the VM hostnames are scoped
using the prefix, ensuring full isolation between deployments.

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

Author: ehelms

Vagrantfile

@@ -1,3 +1,7 @@
+require 'digest'
+
+prefix = Digest::MD5.hexdigest(Dir.pwd)[0..7]
+
 Vagrant.configure("2") do |config|
   config.vm.synced_folder ".", "/vagrant"
 
@@ -12,9 +16,10 @@ Vagrant.configure("2") do |config|
 
   config.vm.define "quadlet" do |override|
     override.vm.box = ENV.fetch("FOREMANCTL_BASE_BOX", "centos/stream9")
-    override.vm.hostname = "quadlet.example.com"
+    override.vm.hostname = "quadlet.#{prefix}.example.com"
 
     override.vm.provider "libvirt" do |libvirt, provider|
+      libvirt.default_prefix = prefix
       libvirt.memory = 10240
       libvirt.cpus = 4
       libvirt.machine_virtual_size = 30
@@ -23,19 +28,22 @@ Vagrant.configure("2") do |config|
 
   config.vm.define "client" do |override|
     override.vm.box = "centos/stream9"
-    override.vm.hostname = "client.example.com"
+    override.vm.hostname = "client.#{prefix}.example.com"
 
     override.vm.provider "libvirt" do |libvirt, provider|
+      libvirt.default_prefix = prefix
       libvirt.memory = 1024
     end
   end
 
   config.vm.define "database" do |override|
     override.vm.box = "centos/stream9"
-    override.vm.hostname = "database.example.com"
+    override.vm.hostname = "database.#{prefix}.example.com"
 
     override.vm.provider "libvirt" do |libvirt, provider|
+      libvirt.default_prefix = prefix
       libvirt.memory = 2048
     end
   end
 end
+