feat(skills): add full-stack design engineering and compliance skills suite
- Add UI/UX design & anti-slop skills (frontend-design, ui-ux-pro-max, tailwind-design-system, shadcn)
- Add 3D creative skills (threejs suite, canvas-design, algorithmic-art)
- Add React 19 architecture & performance skills (vercel composition & best practices)
- Add zero-CLS skeleton contract (component-skeleton-contract)
- Add resilient forms, type-safe data fetching, and i18n/l10n standards
- Add security, performance, and legal compliance (web-appsec-hardening, web-vitals-performance, eu-legal-compliance, e2e-a11y-testing)
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