{"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-l678o8ga","versions":[{"created_at":"2026-07-25T11:49:35Z","element_count":119,"note":"loop3: 設計時延床 55.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"50fc837aadad895367cb132bfd2412aac641bea1a678ec08b95d70fb8f7c0cdd","version":2},{"created_at":"2026-07-25T11:49:28Z","element_count":119,"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}]}