Add .gitignore for Python cache and test output files

Author: claude

.gitignore

@@ -0,0 +1,31 @@
+# Python cache files
+__pycache__/
+*.py[cod]
+*$py.class
+*.so
+.Python
+
+# Distribution / packaging
+build/
+dist/
+*.egg-info/
+
+# Test outputs and submissions
+submission.json
+arc_consciousness_submission.json
+*.json.test
+
+# Virtual environments
+venv/
+env/
+ENV/
+
+# IDE
+.vscode/
+.idea/
+*.swp
+*.swo
+
+# OS
+.DS_Store
+Thumbs.db