{"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-unpj8ukl","versions":[{"created_at":"2026-08-04T06:50:04Z","element_count":86,"note":"loop3: 設計時延床 65.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"06685d25a773015f4b43ee43931a84c1f16cb374948e22749f218c951f5940fe","version":2},{"created_at":"2026-08-04T06:50:04Z","element_count":86,"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}]}