{"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-2edips52","versions":[{"created_at":"2026-06-10T07:25:44Z","element_count":91,"note":"5軸GA polish 60->98 by M5 (autonomous)","saved_by":"mcp","sha256":"df50209fb447878aff5f64499106d3c72301623af53131754c8048c031b22896","version":2}]}