{"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-9c3irppg","versions":[{"created_at":"2026-07-26T17:35:49Z","element_count":101,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"8323a6ce919267fa22ccbdc699b95069ed6fa367481a6d828633a40c5564784e","version":2},{"created_at":"2026-07-26T17:35:45Z","element_count":101,"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}]}