{"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-d6hluw08","versions":[{"created_at":"2026-06-10T18:29:54Z","element_count":84,"note":"5軸GA polish 56->98 by M5 (autonomous)","saved_by":"mcp","sha256":"372f6649517390a89bdc73fae52618d71c6cd6d10ffe0cc4890597632b0342b9","version":3}]}