docs(HH-626): align Redis claim retry semantics (#171)

Co-authored-by: Rogee <rogee@ipao.vip>

docs/architecture/worker-redis-queue-migration.md

@@ -320,10 +320,15 @@ func (wp *WorkerPool) processRedisMessage(ctx context.Context, msg redis.XMessag
         return
     }
 
-    // Claim 检查：防止多 consumer 竞争同一 job
     now := wp.now()
+    if err := archiveExhaustedRetries(wp.db.WithContext(ctx).Where("id = ?", jobID), now); err != nil {
+        applogger.L().Errorf("archive exhausted job %d failed: %v", jobID, err)
+        return
+    }
+
+    // Claim 检查：防止多 consumer 竞争同一 job
     result := wp.db.WithContext(ctx).Model(&model.BackgroundJob{}).
-        Where("id = ? AND status IN ? AND scheduled_at <= ?",
+        Where("id = ? AND status IN ? AND scheduled_at <= ? AND attempts < max_attempts",
             jobID,
             []string{model.BackgroundJobStatusQueued, model.BackgroundJobStatusRetrying},
             now,