{"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-ddqt73xf","versions":[{"created_at":"2026-08-04T06:52:09Z","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":"2e19619152ed85c501a4e0400e2a6e315fb688578f29831d5029f064dc474f43","version":2},{"created_at":"2026-08-04T06:52:09Z","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}]}