fix: clarify deferred post listing logs

src/services/monitor.ts

@@ -14,6 +14,7 @@ interface ListingScreeningSummary {
   eligible: number;
   outsideRecentWindow: number;
   deferred: number;
+  deferredReason: 'selected-recent-candidate' | 'older-than-fallback' | null;
 }
 
 export class MonitorService {
@@ -57,6 +58,7 @@ export class MonitorService {
           eligible: 0,
           outsideRecentWindow: 0,
           deferred: 0,
+          deferredReason: null,
         };
         let selected: RedditPost | null = null;
 
@@ -126,6 +128,7 @@ export class MonitorService {
           if (!prioritizeRecent || post.created_utc >= recentCutoffSec) {
             selected = post;
             summary.deferred = newestFirst.length - index - 1;
+            summary.deferredReason = 'selected-recent-candidate';
             break;
           }
 
@@ -135,6 +138,7 @@ export class MonitorService {
           summary.outsideRecentWindow += 1;
           if (!fallback || post.created_utc > fallback.created_utc) fallback = post;
           summary.deferred = newestFirst.length - index - 1;
+          summary.deferredReason = 'older-than-fallback';
           break;
         }
 
@@ -232,7 +236,12 @@ export class MonitorService {
       `${summary.eligible} eligible${selected ? ' (selected)' : ''}`,
       `${summary.outsideRecentWindow} outside recent window`,
     ];
-    if (summary.deferred > 0) counts.push(`${summary.deferred} not evaluated after outcome`);
+    if (summary.deferred > 0) {
+      const reason = summary.deferredReason === 'older-than-fallback'
+        ? 'older than eligible fallback'
+        : 'not evaluated after selected recent candidate';
+      counts.push(`${summary.deferred} ${reason}`);
+    }
     this.logger.info(`r/${subreddit} listing: ${counts.join('; ')}`);
   }