fix(connector-rest): return rowCount from query() for the ConnectorQueryResult contract

ConnectorQueryResult now requires rowCount (added for the Notion frame-persist
flow). connector-rest is the second implementor of query() — return
limitedRows.length so the shared contract holds. Surfaced by CI after rebasing
onto main, which introduced connector-rest.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: youhaowei

packages/connector-rest/src/connector.ts

@@ -763,6 +763,7 @@ export class RestConnector extends RemoteApiConnector {
         arrowBuffer: base64,
         fieldIds: fields.map((f) => f.id),
         fields,
+        rowCount: limitedRows.length,
       };
     });
   }