{"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-8wv9ej88","versions":[{"created_at":"2026-06-23T06:08:27Z","element_count":69,"note":"5軸GA polish 45->93 by M5 (autonomous)","saved_by":"mcp","sha256":"00f86236d51666c54a9f18256789304b09267fea84025a29436ff7e05d01e9b0","version":3},{"created_at":"2026-06-23T05:58:26Z","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":"2026-06-23T05:58:26Z","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}]}