{"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-t424ujbz","versions":[{"created_at":"2026-07-20T19:51:10Z","element_count":90,"note":"5軸GA polish 45->96 by M5 (autonomous)","saved_by":"mcp","sha256":"8d39db6c30acd626eb01efe9aca9e5ed846d68b3a3453a10cf238747a987c2b0","version":3},{"created_at":"2026-07-20T19:38:08Z","element_count":126,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"dd5d8b0cbd8818a7f43d365a824da6700bcab209c096990d671b8d6680a8e84a","version":2},{"created_at":"2026-07-20T19:38:08Z","element_count":126,"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}]}