docs: define automation compatibility policy

crates/geth-control/src/lib.rs

@@ -3204,4 +3204,23 @@ mod tests {
             response
         );
     }
+
+    #[test]
+    fn malformed_and_unknown_protocol_inputs_fail() {
+        for input in [
+            "{",
+            "{}",
+            r#"{"type":"unknown"}"#,
+            r#"{"type":"status","extra":}"#,
+        ] {
+            assert!(decode_request(input).is_err());
+            assert!(decode_response(input).is_err());
+            assert!(decode_peer_request(input).is_err());
+            assert!(decode_peer_response(input).is_err());
+            assert!(decode_pipe_wire_request(input).is_err());
+            assert!(decode_pipe_wire_response(input).is_err());
+            assert!(decode_overlay_wire_request(input).is_err());
+            assert!(decode_overlay_wire_response(input).is_err());
+        }
+    }
 }