fix(runtime): derive unattributed cost from usage status

src/main/worker/entry/index.ts

@@ -108,7 +108,6 @@ function cancelRun(runId: string) {
       signal: null,
       model: null,
       usageStatus: "aborted_before_usage",
-      unattributedCost: true,
       inputTokens: null,
       outputTokens: null,
     });

src/main/worker/entry/types.ts

@@ -53,10 +53,9 @@ export const workerMessageSchema = z.union([
     signal: z.string().nullable(),
     model: z.string().nullable(),
     usageStatus: runUsageStatusSchema,
-    unattributedCost: z.boolean(),
     inputTokens: z.number().nullable(),
     outputTokens: z.number().nullable(),
-  }),
+  }).strict(),
   z.object({
     type: z.literal("agent-event"),
     runId: z.string().uuid(),