dsh-remote-shell: DSH Remote Shell Skill Plugin

The DSH plugin `dsh-remote-shell` is built on the Remote Shell skill and provides secure cross-platform remote operations. It supports SSH, Telnet, and WinRM protocols, enabling command execution, file transfer, and an embedded credential store encrypted with Fernet. The plugin registers skills by scanning the `skills/` directory and includes security interception mechanisms. Development requires Python 3 and libraries such as Paramiko, and attention must be paid to code execution risks and file line-ending format requirements.