Improve VM boot diagnostics and guest support

iso/builder/config/hooks/normal/9000-bee-setup.hook.chroot

@@ -11,6 +11,8 @@ systemctl enable bee-nvidia.service
 systemctl enable bee-audit.service
 systemctl enable bee-sshsetup.service
 systemctl enable ssh.service
+systemctl enable qemu-guest-agent.service 2>/dev/null || true
+systemctl enable serial-getty@ttyS0.service 2>/dev/null || true
 
 # Ensure scripts are executable
 chmod +x /usr/local/bin/bee-network.sh  2>/dev/null || true