Show HN: Multi-version management (by xlings) for DeepSeek Harness

xlings support multi-version management for package, I have add support for dsh. you can try it

## Base Usage

xlings install dsh@0.1.0-rc.6 -y && xlings install dsh@0.1.0-rc.3 -y

xlings use dsh

xlings use dsh 0.1.0-rc.6 && dsh --version

xlings use dsh 0.1.0-rc.3 && dsh --version

## Advanced Usage

### In terminal-1

xlings subos new dsh-1

xlings subos use dsh-1

xlings install dsh@0.1.0-rc.6 -y -u

dsh --version

### In terminal-2

xlings subos new dsh-2

xlings subos use dsh-2

xlings install dsh@0.1.0-rc.3 -y -u

dsh --version

Repo: https://github.com/openxlings/xlings