{"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-urp79tzy","versions":[{"created_at":"2026-06-10T07:59:55Z","element_count":90,"note":"5軸GA polish 54->98 by M5 (autonomous)","saved_by":"mcp","sha256":"52259ae9725f3f1fa3fc87ddaf3af4e1a37ae21d1ed48e795d29aaa97ed8684d","version":2}]}