chore: add .gitignore to prevent future .env.local commits

Author: xingjian.ym

integrations/claude-agent-sdk/python/.gitignore

@@ -0,0 +1,31 @@
+# Environment files
+.env
+.env.local
+.env*.local
+
+# Dependencies
+node_modules/
+
+# Build output
+dist/
+build/
+
+# Logs
+logs
+*.log
+npm-debug.log*
+pnpm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# OS
+.DS_Store
+Thumbs.db
+
+# IDE
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+