dsh-resume-turn: Resume Interrupted Replies

`dsh-resume-turn` is a plugin for DeepSeek Harness designed to address the loss of already-generated content when an endpoint is interrupted. By automatically collecting partial output and injecting a visible guiding instruction, it enables the model to resume from the point of interruption rather than restarting from scratch. The plugin supports multiple failure codes and offers flexible configuration, significantly reducing compute waste and making it suitable for agent deployment in slow or unstable network environments.