jolly-dsh-vision: DeepSeek Harness Vision Bridge Plugin

`jolly-dsh-vision` is a visual bridging plugin designed for DeepSeek Harness (DSH), enabling text-only large models to process pixel data. It introduces a dedicated vision model as the "eyes" and provides two visual pathways: invoking the `vision` tool to obtain structured evidence (such as OCR and layout), and enabling the `(ds vision)` twin model to directly support image input. Installation requires the DSH CLI and configuration of the brain and eye models. The plugin includes security features such as zero-touch API key handling and SSRF protection, but has limitations including limited format support and reliance on a single route. The project is released under the MIT License, has zero code dependencies, and aims to improve the accuracy of visual reasoning with a minimal architecture.