{"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-m490i18r","versions":[{"created_at":"2026-06-30T20:03:08Z","element_count":90,"note":"5軸GA polish 42->95 by M5 (autonomous)","saved_by":"mcp","sha256":"63a946bd0e985dd2bf02d0faeef27c1952384cdb1432b1166c791dccffffbed5","version":3},{"created_at":"2026-06-30T19:47:18Z","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":"d1e98ad8cdc126dce9c56fa8cec9b3a18e6b9d4a26785b5be282d83764b79147","version":2},{"created_at":"2026-06-30T19:47:18Z","element_count":101,"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}]}