Give GitHub Copilot brand context

GitHub Copilot reads repository custom instructions from .github/copilot-instructions.md and applies them to completions and Copilot Chat across the project. Without brand context it fills in wrong colors, arbitrary spacing, and system fonts. Generate DESIGN.md from the live site with Dembrandt and paste it into the instructions file. Suggestions then draw on the real token system: the primary, the type scale steps, the spacing rhythm, the border radii. Scaffolds come out closer to on-token, and Copilot Chat can cite brand values rather than guess. Less time correcting invented values after the fact.