{"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-willowbrookhouse-ek8b34e4","versions":[{"created_at":"2026-06-10T17:08:47Z","element_count":72,"note":"5軸GA polish 43->97 by M5 (autonomous)","saved_by":"mcp","sha256":"ffbcd76e3d65d20271eecb8d537641872ab5d66ee6f3f543c7efbf112635c952","version":2}]}