{"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-up7qn4g5","versions":[{"created_at":"2026-08-14T14:40:29Z","element_count":119,"note":"loop3: 設計時延床 60.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"8df41d190bfa798c489528b059fc674a079dad545fb69576ad5463a257d1f98b","version":2},{"created_at":"2026-08-14T14:40:29Z","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}]}