dsh-llm-retry-settings: LLM Auto-Retry and Continuation Configuration Plugin

`dsh-llm-retry-settings` is a DeepSeek Harness (DSH) plugin that enables granular control of automatic LLM retry policies and automatic continuation after output truncation in the Settings -> General interface. It supports custom retry counts, delays, jitter, and error codes, and provides fine-grained per-provider/per-model overrides. Disabled by default, overrides must be enabled manually. Installation requires the `dsh plugin` command and registration in the configuration, making it suitable for scenarios that require enhanced fault tolerance or handling of interrupted outputs.