DESIGN.md: Tell Your AI Agent What to Build, Not Just How to Build It

There’s a gap that most AI coding workflows ignore. You tell your agent how to write the code — but you never tell it how the UI should look. The result is functional pages with no coherent style, inconsistent components, and a design that feels assembled rather than considered. DESIGN.md is a plain-text fix for this. Drop one file in your project root and any AI coding agent instantly understands your visual system — colours, typography, component patterns, spacing, the lot.