Add experimental thread queue APIs to app server (#38456)

## What changed

- Add experimental `thread/queue/add`, `list`, `update`, `delete`, `reorder`, and `start` requests for persistent queued user submissions.
- Automatically dispatch queued submissions in FIFO order after completed or failed turns, while leaving the queue paused after interruption.
- Emit `thread/queue/changed` notifications and expose paginated queue contents with stable submission and client message IDs.
- Export the new protocol types through the generated JSON Schema and TypeScript bindings.

## Testing

- Add app-server integration coverage for capability gating, CRUD, pagination, capacity limits, notifications, automatic dispatch, cold-thread resume, interruption, and explicit queue starts.

GitOrigin-RevId: 89caf5577192199bda77cf6c372a59d26cdd910e

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

@@ -108,6 +108,7 @@ fn server_notification_requires_delivery(notification: &ServerNotification) -> b
     matches!(
         notification,
         ServerNotification::TurnCompleted(_)
+            | ServerNotification::ThreadQueueChanged(_)
             | ServerNotification::ThreadSettingsUpdated(_)
             | ServerNotification::ExternalAgentConfigImportCompleted(_)
     )
@@ -780,6 +781,7 @@ mod tests {
     use codex_app_server_protocol::ConfigRequirementsReadResponse;
     use codex_app_server_protocol::ExternalAgentConfigImportCompletedNotification;
     use codex_app_server_protocol::SessionSource as ApiSessionSource;
+    use codex_app_server_protocol::ThreadQueueChangedNotification;
     use codex_app_server_protocol::ThreadStartParams;
     use codex_app_server_protocol::ThreadStartResponse;
     use codex_app_server_protocol::Turn;
@@ -996,6 +998,11 @@ mod tests {
                 },
             })
         ));
+        assert!(server_notification_requires_delivery(
+            &ServerNotification::ThreadQueueChanged(ThreadQueueChangedNotification {
+                thread_id: "thread-1".to_string(),
+            })
+        ));
         assert!(server_notification_requires_delivery(
             &ServerNotification::ExternalAgentConfigImportCompleted(
                 ExternalAgentConfigImportCompletedNotification {