{"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-41kus8dg","versions":[{"created_at":"2026-06-10T18:29:54Z","element_count":92,"note":"5軸GA polish 60->98 by M5 (autonomous)","saved_by":"mcp","sha256":"a32b9da49c176199ab613d4e13a8d6286f57a5c2b29ced30447e1cfda8e62282","version":3}]}