feat: harden gateway with policy engine, secure tools, and governance docs

scripts/check_key_age.py

@@ -135,5 +135,6 @@ if __name__ == "__main__":
     except Exception as e:
         print(f"\n❌ Error: {e}", file=sys.stderr)
         import traceback
+
         traceback.print_exc()
         sys.exit(1)