{"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-rtmd9ffg","versions":[{"created_at":"2026-07-30T07:46:41Z","element_count":87,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"f0e8b8dea68cfa05cb84a088fb67693a6d5a8b4fd782a6e42cfe33c60ef04516","version":2},{"created_at":"2026-07-30T07:46:41Z","element_count":87,"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}]}