{"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-xqhplgt8","versions":[{"created_at":"2026-06-27T05:58:54Z","element_count":89,"note":"5軸GA polish 42->95 by M5 (autonomous)","saved_by":"mcp","sha256":"b0dab6a1e8978c243099e8eef30fd7f57a58ee8666803377112334bc1381bf20","version":3},{"created_at":"2026-06-27T05:48:57Z","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":"5bf20dd353d505591fe6f13fdbca4234d618fca6b841715888595c570611a682","version":2},{"created_at":"2026-06-27T05:48:57Z","element_count":126,"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}]}