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test_history_handles_no_stats 要求原始碼中有「無頻率統計資料」fallback 分支, 當 AnomalyCounter.record_anomaly() 回傳 None 時顯示此訊息而非繼續處理。 Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>