dsh-grid-system: Grid and Spacing System Reference

`dsh-grid-system` is a pure Node implementation of a DeepSeek Harness plugin, providing a local reference implementation for grid and spacing systems. It features zero network dependencies and zero external service calls. To install it, run the `dsh plugin add` command and include `dsh.profile.bundles` in the configuration. Before use, ensure that the dependency versions meet the requirements, and review the source code yourself to ensure security.