Add phase-1 Ansible foundation and validation scaffolding

infrastructure/ansible/inventory/hosts.yml

@@ -0,0 +1,17 @@
+---
+all:
+  children:
+    linux:
+      hosts: {}
+    network:
+      hosts: {}
+    virtualization:
+      hosts: {}
+    nixos:
+      hosts: {}
+    examples:
+      hosts:
+        example-managed-host:
+          ansible_host: example-host.local
+          ansible_connection: ssh
+          # Example only: replace/remove before real operations.