{"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-27brmlc5","versions":[{"created_at":"2026-06-10T07:41:55Z","element_count":91,"note":"5軸GA polish 56->98 by M5 (autonomous)","saved_by":"mcp","sha256":"c9307d4c4a4e95ec10629ca0d92323d32e1609b3a711b10f5ed37abc00719bab","version":2}]}