Introduction to the dsh-union Plugin

`dsh-union` is a pure Node.js plugin for DeepSeek Harness (DSH) that provides collection union operations and is maintained by `uckkk`. Its core function is to enable merging of collection data without external network dependencies, offering efficient and stable execution. The install command is `dsh plugin add github:uckkk/dsh-union`. The plugin depends on `@deepseek-ai/cordis` and `@deepseek-ai/dsh-tools`, is suited for collection data merging scenarios, and is licensed under the MIT License.