{"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-3pbwbm44","versions":[{"created_at":"2026-06-13T20:14:34Z","element_count":90,"note":"5軸GA polish 42->95 by M5 (autonomous)","saved_by":"mcp","sha256":"c0219263e4fb899bc362b2aadaa19142bff557404fc2f7a282db3e07bb57262f","version":3},{"created_at":"2026-06-13T20:00:24Z","element_count":101,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"844d6ea16fbf144381cfb610322a0ac91245b35b161192948240eaf736b39453","version":2},{"created_at":"2026-06-13T20:00:22Z","element_count":101,"note":"言葉から生成: LDK+主寝室+子供室+浴室+収納","saved_by":"mcp:create","sha256":"","version":1}]}