Add app-server event tracing (#12695)

To help with debugging

codex-rs/app-server/src/codex_message_processor.rs

@@ -5899,6 +5899,11 @@ impl CodexMessageProcessor {
                             EventMsg::TurnComplete(_) => "task_complete",
                             _ => &event.msg.to_string(),
                         };
+                        let request_event_name = format!("codex/event/{event_formatted}");
+                        tracing::trace!(
+                            conversation_id = %conversation_id,
+                            "app-server event: {request_event_name}"
+                        );
                         let mut params = match serde_json::to_value(event.clone()) {
                             Ok(serde_json::Value::Object(map)) => map,
                             Ok(_) => {
@@ -5933,7 +5938,7 @@ impl CodexMessageProcessor {
                                 .send_notification_to_connections(
                                     &subscribed_connection_ids,
                                     OutgoingNotification {
-                                        method: format!("codex/event/{event_formatted}"),
+                                        method: request_event_name,
                                         params: Some(params.into()),
                                     },
                                 )

codex-rs/app-server/src/message_processor.rs

@@ -213,6 +213,12 @@ impl MessageProcessor {
         session: &mut ConnectionSessionState,
         outbound_initialized: &AtomicBool,
     ) {
+        let request_method = request.method.as_str();
+        tracing::trace!(
+            ?connection_id,
+            request_id = ?request.id,
+            "app-server request: {request_method}"
+        );
         let request_id = ConnectionRequestId {
             connection_id,
             request_id: request.id.clone(),

codex-rs/app-server/src/outgoing_message.rs

@@ -275,6 +275,10 @@ impl OutgoingMessageSender {
         connection_ids: &[ConnectionId],
         notification: ServerNotification,
     ) {
+        tracing::trace!(
+            targeted_connections = connection_ids.len(),
+            "app-server event: {notification}"
+        );
         let outgoing_message = OutgoingMessage::AppServerNotification(notification);
         if connection_ids.is_empty() {
             if let Err(err) = self