Update README with verified codebase numbers, fix labels and node type classification

README:
- All metrics verified against codebase: 427 Rust files/175K LOC,
  370 client files/96K LOC, 40+ actors, 71 skills, 285 docs
- CUDA 13.1, Binary Protocol V5, 48-byte position updates
- Remove unverified claims (180K node count, 100+ CUDA kernels)
- Add WebGPU/WebGL dual-renderer documentation
- Add THG world record link for immersive validation
- Remove non-existent logo SVG references

Client fixes:
- InstancedLabels: fix WebGPU label rendering — use useState instead
  of mutable ref so React re-renders when labels update. Read positions
  from SharedArrayBuffer (zero-lag). Reduce throttle from 15 to 3 frames.
  Add nodePositionsRef to WebGPU component destructuring.
- useGraphVisualState: fix nodeTypeMap flag-bit mismatch — binaryNodeTypeMap
  stores masked IDs but lookup used raw IDs. Add masked ID fallback so
  all 934 nodes get correct type classification for edge visibility.

Co-Authored-By: claude-flow <ruv@ruv.net>

Author: Roo Code