{"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-wsy8bb6l","versions":[{"created_at":"2026-07-22T05:58:59Z","element_count":88,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"c16a59563ade0c540f450a600f3504988e769dbf29742406f326213e32820573","version":2},{"created_at":"2026-07-22T05:58:59Z","element_count":88,"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}]}