Summary

• replace hero Spline robot scene with a custom Three.js
• keep desktop-first reactive 3D with mobile + reduced-motion fallback
• remove Spline dependencies and dead Spline components
• preserve existing hero CTA/copy structure and project-page behavior

Validation

• npm run lint
• npm run type-check
• npm run test
• npm run build
• browser QA: renders reactive node system; still has no right-side rail and no horizontal overflow

Notes

• generated remains uncommitted