{"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-zr5wagtm","versions":[{"created_at":"2026-07-06T02:16:53Z","element_count":184,"note":"言葉から生成: L字 / 狭小の町家・吹抜・坪庭 / 吹抜 / 坪庭 / 土間","saved_by":"mcp:create","sha256":"","version":1}]}