DSH Plugin: Forwarding DSH Events to YierPet Sentinel

`dsh-yierpet-sentinel` is a plugin for DeepSeek Harness (DSH) that synchronizes DSH state to the desktop pet YierPet. It monitors the DSH event stream and forwards events to a local endpoint using a fire-and-forget approach, supporting multiple event feedback types such as `turn/start`, `tool/result`, and `approval/asked`. Installation requires YierPet to be running locally and the listening address to be properly configured, and requests are subject to a one-second timeout. The plugin is designed not to block the main process, handles all errors silently, and provides users with visual CLI status feedback.