{"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-xos7redn","versions":[{"created_at":"2026-08-20T15:41:23Z","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":"3efb046d028e29d4101af2fe4f816c5846e84a2be40884e2290ede539d4e1420","version":2},{"created_at":"2026-08-20T15:41:18Z","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}]}