{"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-5m7ygcg1","versions":[{"created_at":"2026-06-13T16:42:57Z","element_count":84,"note":"5軸GA polish 40->94 by M5 (autonomous)","saved_by":"mcp","sha256":"b7b971a29222d1aeab210247d1f0939275cd0bbfcf50f85c4404ce9e762a4ef5","version":3},{"created_at":"2026-06-13T16:37:09Z","element_count":119,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"a0d714806d672ba86d3c3c28958823fb785f8609ce24b45fd21068607d7a3700","version":2},{"created_at":"2026-06-13T16:37:02Z","element_count":119,"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}]}