{"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-ztdfg7g7","versions":[{"created_at":"2026-08-20T15:48:54Z","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":"cc6776018e61c0df2a6badc4511ff85465f7ae167adc1f673f41d5ca86b2be28","version":2},{"created_at":"2026-08-20T15:48:54Z","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}]}