{"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-jerc2hc5","versions":[{"created_at":"2026-06-10T16:39:03Z","element_count":84,"note":"5軸GA polish 54->98 by M5 (autonomous)","saved_by":"mcp","sha256":"fabc5f5792ba554969ad22924d8728c0cae3f8d691d4a23adb1d8959fd51ced8","version":2}]}