SchemeCommand::levels()/selectors()/blocks() move to a new
SchemeStylesheet, and Scheme gains forStylesheet(), which resolves a
scheme (and every profile) at all three contrast levels together. Plan
step 40's fallback needs to draw the same colours material:scheme
writes, without duplicating its selector logic.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9
