{"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-b16paw36","versions":[{"created_at":"2026-06-13T20:00:15Z","element_count":90,"note":"5軸GA polish 44->98 by M5 (autonomous)","saved_by":"mcp","sha256":"91d590c12b6702c5977f0175967288d37b824083164d8831a0c2467b4114880a","version":3},{"created_at":"2026-06-13T19:45:19Z","element_count":89,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"b80e3626a220f4840cbdee77d50507747ad194644b6872e335f74aaf7a74ebd6","version":2},{"created_at":"2026-06-13T19:45:17Z","element_count":89,"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}]}