{"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-ymgdaw2s","versions":[{"created_at":"2026-06-10T18:46:39Z","element_count":91,"note":"5軸GA polish 56->97 by M5 (autonomous)","saved_by":"mcp","sha256":"db704b0493d8d145be5bd02c882d5bacbf4a0971e3e7e5094522e144cad61dfe","version":3}]}