dsh-self-restart: Desktop Self-Restart and Session Handoff in DeepSeek Harness

`dsh-self-restart` is a community plugin for DeepSeek Harness designed to address the interruption of persistent sessions after a Desktop process restart. It runs in the Host process, reading handoff files to restore sessions and automatically execute subsequent tasks. After users configure parameters such as `mission`, the plugin can seamlessly resume workflows after restart without requiring manual relaunching.