{"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-l5yvyk9o","versions":[{"created_at":"2026-07-24T03:09:39Z","element_count":88,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"bc419ad56c66099bebf38fa87788b83aedd46875fe42b67ec4517d328373f70d","version":2},{"created_at":"2026-07-24T03:09:38Z","element_count":88,"note":"言葉から生成: LDK+主寝室+子供室2+浴室+収納","saved_by":"mcp:create","sha256":"","version":1}]}