{"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-ixtjz48b","versions":[{"created_at":"2026-06-18T19:46:08Z","element_count":69,"note":"5軸GA polish 42->93 by M5 (autonomous)","saved_by":"mcp","sha256":"b7afdabd1715ae772338cfce1bda6d7289cc9486fe66695ac744cadbaf98221b","version":3},{"created_at":"2026-06-18T19:34:05Z","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":"4074a6158cafd5585f83568728e404dbdcbbd07568f59f2d7ab8567cdc57d666","version":2},{"created_at":"2026-06-18T19:34:02Z","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}]}