{"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-gem2vtnk","versions":[{"created_at":"2026-06-10T15:36:53Z","element_count":84,"note":"5軸GA polish 54->98 by M5 (autonomous)","saved_by":"mcp","sha256":"69f958a3599a7aa85917724fcab37c44cd1b55d467eb2ca437119c91507c4b79","version":4}]}