{"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-vnygd9wm","versions":[{"created_at":"2026-06-10T18:14:05Z","element_count":90,"note":"5軸GA polish 56->98 by M5 (autonomous)","saved_by":"mcp","sha256":"548212de1302ad8578b324df26324bf6a62bd608bc4780717479afa168d0cb67","version":3}]}