fix(release): parse agent-run status JSON when worker emits multiple blocks

Release drain was timing out because --status now prints a preamble JSON blob without queue; pick the object that contains queue instead of sed from the first brace.

Co-authored-by: Cursor <cursoragent@cursor.com>

scripts/release-portal-runtime-prod.sh

@@ -633,7 +633,19 @@ block_new_agent_runs_for_release() {
 
 read_agent_run_status_json() {
   local worker_script="$1"
-  node "${worker_script}" --status 2>/dev/null | sed -n '/^{/,$p' || true
+  node "${worker_script}" --status 2>/dev/null | node --input-type=module -e '
+let s = "";
+process.stdin.on("data", (chunk) => { s += chunk; });
+process.stdin.on("end", () => {
+  let best = null;
+  for (const match of s.matchAll(/\{[\s\S]*?\}/g)) {
+    try {
+      const obj = JSON.parse(match[0]);
+      if (obj && typeof obj === "object" && obj.queue) best = JSON.stringify(obj);
+    } catch {}
+  }
+  if (best) process.stdout.write(best);
+});' || true
 }
 
 drain_active_agent_runs() {