{"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-v5v4m6ru","versions":[{"created_at":"2026-08-14T09:34:58Z","element_count":130,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"662493fc2deebf0f9b9abc597e68ab15fafdba60c35ecaabf6df794ff4dc87a5","version":2},{"created_at":"2026-08-14T09:34:58Z","element_count":130,"note":"言葉から生成: LDK+主寝室+子供室+浴室+収納","saved_by":"mcp:create","sha256":"","version":1}]}