Screen all older fallback candidates

tests/monitor.test.ts

@@ -345,7 +345,7 @@ describe('MonitorService', () => {
     expect(result[0].id).toBe('t3_old');
   });
 
-  it('labels deferred listing posts as older than the eligible fallback', async () => {
+  it('screens every older fallback candidate before selecting the newest one', async () => {
     const now = Math.floor(Date.now() / 1000);
     const fallback: RedditPost = {
       id: 't3_fallback', subreddit: 'sub1', author: 'u_fallback', title: 'Fallback',
@@ -360,14 +360,14 @@ describe('MonitorService', () => {
         recentWindowMinutes: 60,
       },
     });
-    monitor = new MonitorService(
-      createMockRedditApi([fallback, older]), createMockPostsRepo(), createMockMessagesRepo(), config, logger, 0,
-    );
+    const redditApi = createMockRedditApi([fallback, older]);
+    monitor = new MonitorService(redditApi, createMockPostsRepo(), createMockMessagesRepo(), config, logger, 0);
 
-    await monitor.getUnprocessedPosts();
+    await expect(monitor.getUnprocessedPosts()).resolves.toEqual([fallback]);
 
+    expect(redditApi.isSellerProfile).toHaveBeenCalledTimes(2);
     expect(logger.logs).toContainEqual(expect.objectContaining({
-      message: expect.stringContaining('1 older than eligible fallback'),
+      message: expect.stringContaining('2 eligible; 2 outside recent window'),
     }));
   });