{"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-1alob608","versions":[{"created_at":"2026-06-10T15:37:13Z","element_count":88,"note":"5軸GA polish 60->98 by M5 (autonomous)","saved_by":"mcp","sha256":"d670baca2266d8c762c2d424b73d611a55379f28a27f6fbcd1c486a51dd11fde","version":4}]}