DeepSeek Harness Plugin: dsh-plugin-pyrun

`dsh-plugin-pyrun` is a Python code execution plugin for DeepSeek Harness (DSH), designed to address issues with Shell escaping, two-step execution overhead, and encoding anomalies. It executes code by piping input directly through `stdin`, and supports foreground/background modes, end-to-end UTF-8 handling, sandbox control, and job management. Installation requires using the `link:` method and a restart; the tool supports multiple parameter configurations and result markers.