Initial commit: skills library

- 70 skills with code and documentation
- Add .gitignore (ignore __pycache__, output/, temp/, venv/)
- Clean up test intermediates and caches

.gitignore

@@ -0,0 +1,40 @@
+# Bytecode
+__pycache__/
+*.py[cod]
+*$py.class
+*.pyo
+*.pyd
+
+# Virtual environments
+venv/
+.venv/
+env/
+ENV/
+
+# Node
+node_modules/
+.npm
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Test outputs and intermediates
+output/
+output/**/
+
+# Pytest
+.pytest_cache/
+.coverage
+htmlcov/
+
+# IDE
+.vscode/
+.idea/
+*.swp
+*.swo
+*.log
+
+# Temp files
+temp/
+*.tmp