{"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-bcum3sig","versions":[{"created_at":"2026-06-13T14:35:17Z","element_count":73,"note":"5軸GA polish 45->94 by M5 (autonomous)","saved_by":"mcp","sha256":"b3875ee3f425a4f7da984e1b2f2653fb07afb6c14d57c140c0ab3b5b8bb4a80c","version":3},{"created_at":"2026-06-13T14:30:32Z","element_count":126,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"17a9869270ade742d896274046ee28df21353ef957d37caaa04e5c488f008ab3","version":2},{"created_at":"2026-06-13T14:30:30Z","element_count":126,"note":"言葉から生成: LDK+主寝室+子供室+浴室+収納","saved_by":"mcp:create","sha256":"","version":1}]}