Add terraform-azurerm-set-diff-analyzer skill

Add a new skill that analyzes Terraform plan JSON output for AzureRM Provider
to distinguish between false-positive diffs (order-only changes in Set-type
attributes) and actual resource changes.

This skill helps users identify 'noise' in terraform plan output caused by
Azure API returning Set elements in different order, making plan reviews
easier and reducing confusion in CI/CD pipelines.

Bundled assets:
- references/azurerm_set_attributes.json
- references/azurerm_set_attributes.md
- scripts/analyze_plan.py

skills/terraform-azurerm-set-diff-analyzer/scripts/.gitignore

@@ -0,0 +1,74 @@
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+
+# PyInstaller
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+
+# Translations
+*.mo
+*.pot
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/
+
+# pytype static type analyzer
+.pytype/
+
+# Cython debug symbols
+cython_debug/