{"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-tgxaxux6","versions":[{"created_at":"2026-06-10T18:13:18Z","element_count":85,"note":"5軸GA polish 60->98 by M5 (autonomous)","saved_by":"mcp","sha256":"3d4b59c260946d0c665d5b5be306d36da68fdf9d13b1094967d6c6ac387af185","version":3}]}