[cooper/sessions/cooper/1ac0484a-7218-49af-b2c7-682ab3db7c40#L11] Assistant: HEARTBEAT_OK 腳本正常完成。掃描過去 12 小時 Bloomberg 郵件，收件夾有 3 封來自 bbalert@bloomberg.net，但均非信用評等變動（升評/降評/撤回）。已發送 Telegram 通知：`Credit Rating Alert：過去12小時無 Bloomberg 信用評等變動郵件。(08:00 HKT)`
[cooper/sessions/cooper/d1cdc5b9-5f39-4b0f-927d-7034c1c54701#L16] Assistant: Sync completed, no diff. Now read the result JSON and send Telegram notification.
[cooper/sessions/cooper/d1cdc5b9-5f39-4b0f-927d-7034c1c54701#L22] Assistant: has_diff is false, so send the simple no-diff message per instructions.
