Fix button atom's dead .btn-outline-primary → .btn-secondary; add 'ghost'
variant (.btn-ghost, CIBG-documented). RTE toolbar drops invented
.btn-outline-secondary/.btn-sm for .btn-ghost. file-input already used the
correct vendored .btn-upload pattern from the earlier CIBG UI fidelity
pass — no change needed there (documented as a deviation).
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Turns the prior roadmap sketch into ordered, gated work packages (enforcement
gates, FP/DDD consistency, CIBG fidelity, Storybook curriculum, a11y) from the
2026-07-02 showcase-hardening audit.
