dsh-safety-restart: Safe & Seamless Restart Plugin for DeepSeek Harness

`dsh-safety-restart` is a safe restart plugin for DeepSeek Harness that allows an Agent to restart after modifying host code. It ensures a secure and controllable restart through four gates: circuit breaker, session checks, bundle validation, and other controls. The plugin supports relaunching the desktop Electron app and process exit mechanisms for Web/CLI, and provides session recovery and audit logging. The Agent can trigger a restart via API calls or manually, making it suitable for scenarios that require frequent host code adjustments.