Brand guardrail for AI-generated UI

AI coding tools generate plausible UI that is subtly off-brand: close colors, almost-right spacing, a type scale that drifts a step. With the Dembrandt MCP server connected, the agent has two tools beyond extraction: compute_drift scores any two token sets, and render_report turns the result into a self-contained HTML report. The loop is simple. The agent extracts your production brand once as the baseline, builds the feature, extracts its own rendered output, and computes drift. If the score crosses your threshold the agent fixes its own work before handing it back. The brand becomes a measurable constraint, not a line in the prompt.