DeepSeek Harness Plugin: dsh-ssh-tunnel

`dsh-ssh-tunnel` is a community plugin for DeepSeek Harness (DSH) that addresses permission and interaction challenges in multi-host SSH access. It provides an SSHManager tool to `dsh-better-sidebar`, supporting host and key management via local `hosts.json` and `secrets.json` files, and implementing fine-grained authorization control based on project paths. Core features include remote command execution, SFTP file management, and an interactive terminal interface. The plugin adopts a non-invasive design and does not replace the global file system. After installation, models can interact with remote hosts through standard tool interfaces, with support for session reuse policies. Data is stored locally with restricted permissions, providing a high level of security.