fix(scheduler): Resolve CI module export error in lock-utils

- Fix `SyntaxError: The requested module './lock-utils.mjs' does not provide an export named 'withTimeout'` by refactoring exports in `src/lock-utils.mjs`.
- Explicitly import `relayListLabel` and `mergeRelayList` from `src/utils.mjs` before exporting them to avoid ambiguous export behavior in some environments.

Co-authored-by: PR0M3TH3AN <[email protected]>

src/lock-utils.mjs

@@ -1,9 +1,9 @@
 import fs from 'node:fs/promises';
 import path from 'node:path';
 import { randomInt } from 'node:crypto';
-import { todayDateStr, getIsoWeekStr } from './utils.mjs';
+import { todayDateStr, getIsoWeekStr, relayListLabel, mergeRelayList } from './utils.mjs';
 
-export { relayListLabel, mergeRelayList } from './utils.mjs';
+export { relayListLabel, mergeRelayList };
 
 /**
  * Scans the local log directory to identify agents that have already completed their task
@@ -51,6 +51,15 @@ export async function getCompletedAgents(cadence, logDir, deps) {
   return completed;
 }
 
+export function withTimeout(promise, timeoutMs, timeoutMessage) {
+  let timeoutHandle;
+  const timeoutPromise = new Promise((_, reject) => {
+    timeoutHandle = setTimeout(() => reject(new Error(timeoutMessage)), timeoutMs);
+  });
+  return Promise.race([promise, timeoutPromise]).finally(() => {
+    if (timeoutHandle) clearTimeout(timeoutHandle);
+  });
+}
 
 const MAX_RANDOM = 281474976710655; // 2**48 - 1