{"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-ywurc85m","versions":[{"created_at":"2026-08-14T09:30:46Z","element_count":89,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"0d5a33cda8c783a186d8f760fdf1cd0c52c18beab0de39315fe2222d9b71031d","version":2},{"created_at":"2026-08-14T09:30:46Z","element_count":89,"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}]}