{"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-x0xl70nw","versions":[{"created_at":"2026-06-19T02:38:12Z","element_count":177,"note":"言葉から生成: 中庭ロの字 / 中庭のある回遊動線・ロの字","saved_by":"mcp:create","sha256":"","version":1}]}