feat: add pagination to run messages endpoint (#5082)

* feat: add pagination to run messages endpoint

* chore: regenerate API client with pagination parameters

fern/openapi.json

@@ -10207,6 +10207,19 @@
               "title": "Order"
             },
             "description": "Sort order for messages by creation time. 'asc' for oldest first, 'desc' for newest first"
+          },
+          {
+            "name": "order_by",
+            "in": "query",
+            "required": false,
+            "schema": {
+              "const": "created_at",
+              "type": "string",
+              "description": "Field to sort by",
+              "default": "created_at",
+              "title": "Order By"
+            },
+            "description": "Field to sort by"
           }
         ],
         "responses": {

letta/server/rest_api/routers/v1/runs.py

@@ -187,6 +187,7 @@ async def list_run_messages(
     order: Literal["asc", "desc"] = Query(
         "asc", description="Sort order for messages by creation time. 'asc' for oldest first, 'desc' for newest first"
     ),
+    order_by: Literal["created_at"] = Query("created_at", description="Field to sort by"),
 ):
     """Get response messages associated with a run."""
     actor = await server.user_manager.get_actor_or_default_async(actor_id=headers.actor_id)