{"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-twzyf2xa","versions":[{"created_at":"2026-06-10T17:39:44Z","element_count":84,"note":"5軸GA polish 60->98 by M5 (autonomous)","saved_by":"mcp","sha256":"97662bd541640e3bbf61ea25f16b159d6c0164d97e952931713f3f84652b270c","version":3}]}