{"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-n2cy402a","versions":[{"created_at":"2026-08-17T11:42:12Z","element_count":101,"note":"loop3: 設計時延床 41.2㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"b2106f0f97805c082faf9e918ba7274b644655d80d3c79d3fe292fcf366bd2b2","version":2},{"created_at":"2026-08-17T11:42:12Z","element_count":101,"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}]}