{"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-1ljprwtl","versions":[{"created_at":"2026-07-28T06:20:16Z","element_count":101,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"51b1866227d855d501914c15bb2ea8d0c7c27b6ec5775a86d6933e392a4d3021","version":2},{"created_at":"2026-07-28T06:20:16Z","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}]}