{"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-w3y9o7jy","versions":[{"created_at":"2026-06-10T16:09:04Z","element_count":89,"note":"5軸GA polish 58->98 by M5 (autonomous)","saved_by":"mcp","sha256":"0b862f431f2b9f5ef3f55742257dbfbdb024ab9d648c9dfe6e9005c5d3073a92","version":3}]}