fix: introduce codex-protocol crate (#2355)

codex-rs/core/src/codex.rs

@@ -677,7 +677,10 @@ impl Session {
                 call_id,
                 command: command_for_display.clone(),
                 cwd,
-                parsed_cmd: parse_command(&command_for_display),
+                parsed_cmd: parse_command(&command_for_display)
+                    .into_iter()
+                    .map(Into::into)
+                    .collect(),
             }),
         };
         let event = Event {
@@ -1031,8 +1034,8 @@ async fn submission_loop(
                         Arc::new(per_turn_config),
                         None,
                         provider,
-                        effort,
-                        summary,
+                        effort.into(),
+                        summary.into(),
                         sess.session_id,
                     );
 
@@ -1102,7 +1105,13 @@ async fn submission_loop(
                             crate::protocol::GetHistoryEntryResponseEvent {
                                 offset,
                                 log_id,
-                                entry: entry_opt,
+                                entry: entry_opt.map(|e| {
+                                    codex_protocol::message_history::HistoryEntry {
+                                        session_id: e.session_id,
+                                        ts: e.ts,
+                                        text: e.text,
+                                    }
+                                }),
                             },
                         ),
                     };
@@ -1160,6 +1169,9 @@ async fn submission_loop(
                 }
                 break;
             }
+            _ => {
+                // Ignore unknown ops; enum is non_exhaustive to allow extensions.
+            }
         }
     }
     debug!("Agent loop exited");