refactor(queue): share next-item drain helper across queue drains

src/utils/queue-helpers.ts

@@ -129,6 +129,19 @@ export function waitForQueueDebounce(queue: {
   });
 }
 
+export async function drainNextQueueItem<T>(
+  items: T[],
+  run: (item: T) => Promise<void>,
+): Promise<boolean> {
+  const next = items[0];
+  if (!next) {
+    return false;
+  }
+  await run(next);
+  items.shift();
+  return true;
+}
+
 export function buildQueueSummaryPrompt(params: {
   state: QueueSummaryState;
   noun: string;