DeepSeek Relay Thinking Intensity Adapter Plugin

DeepSeek Harness provides the `dsh-deepseek-relay` plugin to address missing reasoning levels and incompatible parameter formats when using DeepSeek models via a relay service. The plugin supports Off/Low/High/Max reasoning levels, automatically adapts the thinking-parameter format, and enables image recognition and multi-route mounting. Users can install it from source or as a combined package and configure providers, models, and supportsVision. When upgrading, explicitly declare vision capabilities, and note that the plugin is a third-party compatibility layer.