DeepSeek Harness Plugin: dsh-plugin-tic80

`dsh-plugin-tic80` is a DeepSeek Harness plugin built for the TIC-80 virtual machine. Through 13 type-safe tools, it exposes the full game development workflow to LLMs, supporting conversational generation of code, maps, pixel art, and sound effects. The plugin supports web embedding and real-time hot reloading, provides multiple prebuilt templates, and allows one-click export to Lua, TIC, or HTML formats. It combines the retro experience of TIC-80 with the generative capabilities of large language models, offering agent developers a practical game development environment.