{"note":"bim_versions 導入後の保存のみ記録 (それ以前は bim_canonical 上書きで履歴なし)","ok":true,"slug":"u-house-13fbc59w","versions":[{"created_at":"2026-06-10T13:26:59Z","element_count":85,"note":"backfill: 延床=居室床スラブ実面積81.7㎡(基礎/屋外/ロフト除外)。設備数量/コスト過大の是正","saved_by":"mcp","sha256":"36e68d6f412e75e3535e685c12350bd3c4996437f0fb0bacecb612b8c4ef8856","version":9},{"created_at":"2026-06-10T11:26:46Z","element_count":91,"note":"5軸GA polish 54->98 by M5 (autonomous)","saved_by":"mcp","sha256":"df52fa34e53768115c325e52bf9e29b4e4d43b0df95ae17ae66ff46aeab450ac","version":3}]}