Remove request_user_input call_id plumbing

codex-rs/protocol/src/protocol.rs

@@ -222,9 +222,6 @@ pub enum Op {
     UserInputAnswer {
         /// Turn id for the in-flight request.
         id: String,
-        /// Tool call id for the in-flight request, if available.
-        #[serde(skip_serializing_if = "Option::is_none")]
-        call_id: Option<String>,
         /// User-provided answers.
         response: RequestUserInputResponse,
     },

codex-rs/protocol/src/request_user_input.rs

@@ -43,12 +43,6 @@ pub struct RequestUserInputResponse {
     pub answers: HashMap<String, RequestUserInputAnswer>,
 }
 
-impl RequestUserInputResponse {
-    pub fn to_tool_output_content(&self) -> Result<String, serde_json::Error> {
-        serde_json::to_string(self)
-    }
-}
-
 #[derive(Debug, Clone, Deserialize, Serialize, PartialEq, Eq, JsonSchema, TS)]
 pub struct RequestUserInputEvent {
     /// Responses API call id for the associated tool call, if available.