{"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-9sc7ttgn","versions":[{"created_at":"2026-06-10T17:23:17Z","element_count":72,"note":"5軸GA polish 43->97 by M5 (autonomous)","saved_by":"mcp","sha256":"1a1fa2ff61a493060336f9b7070a2fb76fde3415275640906270986d36105fac","version":2}]}