feat: add shopify-development skill

- Add comprehensive Shopify development skill with validated GraphQL
- Fixed 4 mutations using Shopify MCP (fulfillmentCreate, appSubscription, etc.)
- Added shopify_graphql.py utilities with pagination & rate limiting
- Updated API version to 2026-01
- Added zircote/.claude as reference source

skills/shopify-development/scripts/.gitignore

@@ -0,0 +1,49 @@
+# Python
+__pycache__/
+*.py[cod]
+*$py.class
+*.so
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+
+# Testing
+.coverage
+.pytest_cache/
+htmlcov/
+.tox/
+.nox/
+coverage.xml
+*.cover
+*.py,cover
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+
+# IDE
+.idea/
+.vscode/
+*.swp
+*.swo
+*~
+
+# OS
+.DS_Store
+Thumbs.db