discover_guests: treat any 192.168.x address as LAN, the lab now spans several subnets

Claude-Session: https://claude.ai/code/session_01JEczyvRjfakkiDNkbZA7PR

playbooks/discover_guests.yml

@@ -11,7 +11,8 @@
 #
 # Extra vars (optional):
 #   adopt         - default false
-#   lan_prefix    - prefix of the LAN, used to pick the right address (default 192.168.2.)
+#   lan_prefix    - address prefix that counts as the LAN; used to pick the right address
+#                   when a guest has several (default 192.168., i.e. any lab subnet)
 #   adopt_ssh_key - public key to push (default: the ansible-key from bootstrap_lxc.yml)
 
 - name: Discover Proxmox guests not in inventory
@@ -21,7 +22,7 @@
 
   vars:
     adopt: false
-    lan_prefix: "192.168.2."
+    lan_prefix: "192.168."
     lan_regex: "^{{ lan_prefix | regex_escape }}"
     adopt_ssh_key: "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAINegitHaQG8i+s412h3wTWf/KvpeX1CEpYFva9MhHR+7 ansible-key"
     # pct "ostype" -> inventory group