dsh-read-image: Plug-and-play Image Reading for Text-only DeepSeek Harness

`dsh-read-image` is an MIT-licensed open-source plugin for DeepSeek Harness (DSH) designed to address the pain point where pure text models cannot directly read image pixels. This plugin enables text routing to accept image inputs, projects image chunks into `[Image #N]` text placeholders, and automatically registers the `read_image` tool. Through this tool, developers can invoke a configurable vision model to read specified images or file paths within a session, converting their content into text for model inference. If the routing itself supports native multimodality, the plugin intelligently falls back to the built-in tool to avoid conflicts. The plugin provides a "Read image" settings block, supporting the configuration of parameters such as the vision model and prompts. Installation requires DSH version 0.1.0-rc.6 or higher; simply add it via the command line and restart. The plugin features environment self-check and failure-safe mechanisms.