dsh-linked-folders: A Multi-Folder Workspace Plugin

The `dsh-linked-folders` plugin for DeepSeek Harness (DSH) emulates the Codex mechanism to overcome the limitation that a model can only access a single directory, providing multi-folder workspace access. The plugin supports both globally persistent links and session-scoped temporary links, which can be managed through a Web interface or natural language commands. Its state is stored in a local configuration file, allowing developers to flexibly build workspace environments without modifying the underlying file sandbox mechanism.