dsh-omit: Ignoring Fields

`dsh-omit` is a plugin for DeepSeek Harness (DSH), maintained by uckkk. It is implemented in pure Node.js and has no network dependencies. As a workflow plugin, it supports field filtering and data cleaning for input data. Users can install it with `dsh plugin add github:uckkk/dsh-omit` and invoke its tools in a session. This plugin is suitable for scenarios requiring the exclusion of sensitive information or simplification of output structures, and can be integrated into workflows with fine-grained control over data flows.