fix(core): read each worker stamp key independently

Author: myftija

packages/core/src/v3/schemas/runEngine.ts

@@ -40,8 +40,8 @@ export type RunAnnotations = z.infer<typeof RunAnnotations>;
 
 /** Lenient read of the worker stamp: works on blobs that predate or fail RunAnnotations. */
 export const WorkerStampAnnotations = z.object({
-  workerCell: z.string().optional(),
-  workerLane: z.string().optional(),
+  workerCell: z.string().optional().catch(undefined),
+  workerLane: z.string().optional().catch(undefined),
 });
 
 export type WorkerStampAnnotations = z.infer<typeof WorkerStampAnnotations>;