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Downcity shared protocol types for cross-package SDK boundaries.
@downcity/type 是 Downcity 跨 package 的共享协议类型包。
它只放需要被多个 package 共同识别的核心协议，避免 @downcity/agent、@downcity/city、@downcity/services 之间产生不必要的直接耦合。
CityModelDescriptor：City 模型目录返回的公开模型信息。CityModel：User City 返回的可执行 City 模型，可被支持 City model 的 SDK 直接消费。isCityModel()：判断一个值是否实现 City model 协议。