chore: add Ansible project scaffolding

Add ansible.cfg (roles_path, inventory, become, fact caching),
requirements.yml placeholder for future collections, .gitignore for
Ansible artifacts, and .ansible-lint config for code quality.

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.ansible-lint

@@ -0,0 +1,19 @@
+---
+# ansible-lint configuration for KNELIAC
+# https://ansible.readthedocs.io/projects/lint/
+
+# Exclude vendored config files from formatting rules (they're content, not YAML)
+exclude_paths:
+  - .git/
+  - .fact_cache/
+  - LICENSE
+
+# Use the default ruleset but be practical about it
+skip_list:
+  # We use inline templates and command modules intentionally
+  - command-instead-of-shell  # Some commands need shell for pipes
+  - risky-shell-pipe          # Legacy script compat; we use set -o pipefail
+
+warn_list:
+  - experimental
+  - name[casing]              # Our task names use sentence case intentionally