{"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-nehkdg0h","versions":[{"created_at":"2026-07-20T06:06:56Z","element_count":89,"note":"5軸GA polish 39->93 by M5 (autonomous)","saved_by":"mcp","sha256":"2380405cbaf1b4f1c929a81c3d2664b75001637013ab0cdee178e38b838fdb9f","version":3},{"created_at":"2026-07-20T06:00:01Z","element_count":101,"note":"loop3: 設計時延床 70.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"1648c86870c629a2650cafee3bd51107fe7d9789775349437e8932db7883a7e6","version":2},{"created_at":"2026-07-20T06:00:00Z","element_count":101,"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}]}