{"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-7a3l8a6a","versions":[{"created_at":"2026-06-13T20:00:28Z","element_count":84,"note":"5軸GA polish 44->98 by M5 (autonomous)","saved_by":"mcp","sha256":"d088e48f9106b6f1e530d1aa238d95da55415bed1b790e0180e3133d3d1c1989","version":3},{"created_at":"2026-06-13T19:48:11Z","element_count":87,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"ecf244fa4bf70be3e69201cfa2a47a2665633effd48a9cdb9e46b95c20391a3a","version":2},{"created_at":"2026-06-13T19:48:08Z","element_count":87,"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}]}