{"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-tsvk5kt1","versions":[{"created_at":"2026-07-22T02:20:37Z","element_count":86,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"40b417f430960ea851a428c1cd2bd5d19c4352fe24a9a808ddc155cbc923a547","version":2},{"created_at":"2026-07-22T02:20:37Z","element_count":86,"note":"言葉から生成: LDK+主寝室+子供室+浴室+収納","saved_by":"mcp:create","sha256":"","version":1}]}