fix: increase waitFor timeout in heartbeat batching test

The test was flaky due to a tight default timeout when waiting for agent payloads.

server/src/__tests__/heartbeat-comment-wake-batching.test.ts

@@ -402,7 +402,7 @@ describe("heartbeat comment wake batching", () => {
 
       gateway.releaseFirstWait();
 
-      await waitFor(() => gateway.getAgentPayloads().length === 2);
+      await waitFor(() => gateway.getAgentPayloads().length === 2, 30_000);
       await waitFor(async () => {
         const runs = await db.select().from(heartbeatRuns).where(eq(heartbeatRuns.agentId, agentId));
         return runs.length === 2 && runs.every((run) => run.status === "succeeded");