{"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-o9z5mzip","versions":[{"created_at":"2026-06-13T20:00:35Z","element_count":89,"note":"5軸GA polish 44->98 by M5 (autonomous)","saved_by":"mcp","sha256":"4a6cb222ff283933181da5f09958136e15d432276ac0fd857d0c0e8882d8746c","version":3},{"created_at":"2026-06-13T19:43:12Z","element_count":107,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"dd87ec339e53e178b86e9452fce140ba29d5b6da100623335460f4f963186018","version":2},{"created_at":"2026-06-13T19:43:11Z","element_count":107,"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}]}