Adds a mandatory pre-step to the frontend-builder agent prompt: invoke the
frontend-design skill at sprint start before creating or modifying any
visible UI component. DESIGN.md rules project-specific tokens; the skill
covers universal principles (typographic hierarchy, alignment, contrast,
focus, density, motion). Skip allowed only for pure logic/data-layer work
with no visual change.
Authored locally during sprint 6 (uncommitted in worktree), bundled into
sprint 7 hygiene as the first commit so it takes effect immediately for
the design refresh work.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>