Add three dependency-cruiser rules that forbid upward edges inside
libs/shared/src/ui: atoms-compose-nothing-above, molecules-below-organisms,
and design-system-not-layout. RD-27 made the atomic ladder expressible by
moving components into atoms/molecules/organisms folders; these rules make
it enforced, so an upward import now fails dep:check instead of shipping.
No pathNot exemption for specs and stories: measured, zero upward edges
exist anywhere in libs/shared/src/ui today, in production code, specs, and
stories alike, so the exemption PLAN proposed has nothing to protect.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
