{"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-8maq4apn","versions":[{"created_at":"2026-06-10T19:02:37Z","element_count":90,"note":"5軸GA polish 61->98 by M5 (autonomous)","saved_by":"mcp","sha256":"591519640fb3e5c9168fe0d0c9b25eb8094051a74fba26b434c9491104ceb8f8","version":3}]}