Add phase-1 Ansible foundation and validation scaffolding

infrastructure/ansible/inventory/group_vars/all.yml

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+---
+# Bootstrap defaults for the Ansible foundation in this repository.
+# Keep secrets and environment-specific auth details out of version control.
+
+# Common interpreter hint for modern Linux hosts. Override per-host if needed.
+ansible_python_interpreter: /usr/bin/python3
+
+# Placeholders for future connection/auth settings:
+# ansible_user: ""
+# ansible_port: 22
+# ansible_ssh_private_key_file: ""
+
+# Add group-specific settings under inventory/group_vars/<group>.yml
+# and host-specific settings under inventory/host_vars/<host>.yml.

infrastructure/ansible/inventory/hosts.yml

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+---
+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.