{"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-k3tabrua","versions":[{"created_at":"2026-08-20T15:38:09Z","element_count":105,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"db16e0077d9f094ae2655e38dce22b91fd9c1268c2848dcd96f17cd1c8a4630b","version":2},{"created_at":"2026-08-20T15:38:06Z","element_count":105,"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}]}