{"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-5t62nwgj","versions":[{"created_at":"2026-07-18T19:38:30Z","element_count":71,"note":"5軸GA polish 41->92 by M5 (autonomous)","saved_by":"mcp","sha256":"f78b6ad6d783cc6b4fe2f4ba5a69d844c903d36fe78d2fe163b069e593c1d60b","version":3},{"created_at":"2026-07-18T19:29:54Z","element_count":86,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"01d228bf3bb1599cc769663a1115cc619886c672b5d51f0eded11b13da5ab935","version":2},{"created_at":"2026-07-18T19:29:54Z","element_count":86,"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}]}