dsh-docker: Local Docker Container and Compose Tools Plugin

dsh-docker is a DeepSeek Harness plugin that wraps the local Docker CLI, enabling agents to directly manage containers, images, logs, and Compose projects. The plugin requires no additional daemon and supports listing containers, viewing logs, and starting or stopping Compose projects. It improves the model experience through safe parameter handling and formatted output, but does not support high-risk operations such as `exec` or image building, and the Compose tool is not concurrency-safe.