DeepSeek Harness Plugin: dsh-auto-continue-429

`dsh-auto-continue-429` is a DeepSeek Harness (DSH) plugin that addresses conversation interruptions caused by API rate limiting or quota exhaustion. It monitors 429 and quota errors, and automatically sends a `continue` message to start a new turn after retries are exhausted. It features a toggle control, an independent counter capped at 20 attempts, and a random backoff strategy. It takes effect after installation and restart, supports customizing parameters via a dialog toggle or a configuration file, and does not require sensitive permissions.