{"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-mteimb4j","versions":[{"created_at":"2026-06-10T16:08:54Z","element_count":84,"note":"5軸GA polish 60->98 by M5 (autonomous)","saved_by":"mcp","sha256":"88f607fb8b5e6ebbbc2f514c828f37c6904c3d2d611f303cbee91cae237a3800","version":3}]}