{"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-yfn2lcdy","versions":[{"created_at":"2026-07-18T19:38:31Z","element_count":91,"note":"5軸GA polish 44->98 by M5 (autonomous)","saved_by":"mcp","sha256":"d13d5823b073eb0f4a4569c0a36da202fb694f3242c41fee9722f2808cc476a8","version":3},{"created_at":"2026-07-18T19:32:17Z","element_count":90,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"1487d13715b9aa8a51c872bcd276ccff46fbbd5c769235eb0c5b223cbd2260ca","version":2},{"created_at":"2026-07-18T19:32:17Z","element_count":90,"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}]}