dsh-imagedit: DeepSeek Harness Local Image Processing and Smooth Image Generation Plugin

The `dsh-imagedit` plugin for DeepSeek Harness (DSH) aims to address imperfections in generated images by providing a local, deterministic image editing pipeline. Core features include quick/AI cutout, cropping, color adjustment, filters, rounded corners, and batch processing (with support for Sprite Sheet generation). The plugin supports Agent tool calls and CLI command-line operations, can generate shapes through automatic suffix correction, and supports PNG/JPEG/WebP export and compression. It is recommended to use it together with `dsh-draw` to post-process generated images and obtain high-quality asset images.