dsh-berlin-city: Berlin City Information

`dsh-berlin-city` is a DeepSeek Harness plugin maintained by uckkk, offering a pure Node.js implementation with no network dependencies. Its core feature is the `city_info` tool, which retrieves structured static information about the city of Berlin. This plugin is suitable for use cases that do not require real-time network queries. The installation command is `dsh plugin add github:uckkk/dsh-berlin-city`, with a dependency on `@deepseek-ai/cordis` ^4.0.1.