{"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-rq6lkp7k","versions":[{"created_at":"2026-06-10T18:29:56Z","element_count":91,"note":"5軸GA polish 56->98 by M5 (autonomous)","saved_by":"mcp","sha256":"219ebbc5c5c1f30dc547d0a627928bf524785cb9bcf159b9458144d3319b379b","version":3}]}