{"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-xewmd6rf","versions":[{"created_at":"2026-06-10T07:42:34Z","element_count":83,"note":"5軸GA polish 54->98 by M5 (autonomous)","saved_by":"mcp","sha256":"0b8c98911e1314f72bd146c54cb31d0f8116af7b40d237de644cb60190f99fca","version":2}]}