{"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-6dtrmv3t","versions":[{"created_at":"2026-07-08T06:05:45Z","element_count":68,"note":"5軸GA polish 46->95 by M5 (autonomous)","saved_by":"mcp","sha256":"0fc02c6b2f39f9f19b15e72b9330a45047587952fce4a41914bc977df5ea903f","version":3},{"created_at":"2026-07-08T05:54:39Z","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":"ad85ccba23a2821ce7ec1cae3baec480b329d4dd3599b3e632911e3403f2df1b","version":2},{"created_at":"2026-07-08T05:54:39Z","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}]}