{"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-c727x00m","versions":[{"created_at":"2026-06-10T07:42:24Z","element_count":89,"note":"5軸GA polish 60->98 by M5 (autonomous)","saved_by":"mcp","sha256":"2375e211d912d6f2eb192a5f47260cce3fbf4a5dc4892b7f6056bb70f3d8e4d8","version":2}]}