{"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-znuwt8o5","versions":[{"created_at":"2026-06-10T14:29:19Z","element_count":90,"note":"5軸GA polish 58->98 by M5 (autonomous)","saved_by":"mcp","sha256":"e4acdd4ea10915cba95a89af8a2486b85cfd0623269d2abf46b78ad243d0d0ec","version":7}]}