Fix the CI failure

scripts/zero-cost-compare.mjs

@@ -394,7 +394,8 @@ export function dynamicTierSymbols(names) {
  * not yet traced to its typed root. bench/thread-slots,
  * bench/channel-messages and bench/worker-messages, added later, link them
  * through worker messages:
- * node:worker_threads values are dyn objects. bench/dynamic-methods is
+ * node:worker_threads values are dyn objects. bench/json-unions, added
+ * later too, decodes JSON.parse trees. bench/dynamic-methods is
  * untyped JavaScript. Every other bench workload is fully typed and must link none. The gate and
  * tests/harness/bench-dynamic-tier.test.ts enforce that, and the test also
  * fails when a listed workload stops linking them, so remove a workload here
@@ -414,6 +415,7 @@ export const DYNAMIC_WORKLOADS = new Set([
   "bench/typed-array-scan-workers",
   "bench/log-summary",
   "bench/inventory-report",
+  "bench/json-unions",
 ]);
 
 /** Names of the functions (text and weak symbols) in `nm` output. Mach-O