dsh-snake: DeepSeek Harness Web Hungry Whale Mini-Game Plugin

The `dsh-snake` plugin for DeepSeek Harness (DSH) renders a Greedy Whale mini-game as a background on the development page. The blue whale acts as a full-viewport background element with click-through behavior, so it does not interfere with content interaction, while developers can control the whale to eat golden tokens. The plugin features a minimal control capsule, direction keys for steering, the spacebar to start/pause, data persistence, and light/dark theme support. The installation command is `dsh plugin --profile web add github:Solicide/dsh-snake`, and the service must be restarted after modifying the code. This tool is intended to provide subtle entertainment breaks and is released under the MIT license.