{"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-j27kdjds","versions":[{"created_at":"2026-08-02T17:49:31Z","element_count":119,"note":"loop3: 設計時延床 70.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"07667c105320ca887863684e05ab38f624de6f73776262533ff74997395a5715","version":2},{"created_at":"2026-08-02T17:49:31Z","element_count":119,"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}]}