Great! The TypeScript test now passes completely. Your voxel data abstraction
layer is working correctly, including:

- Flat memory model (`Uint32Array(512)` per chunk)
- Spatial indexing (`x + y*8 + z*64`)
- All bitwise operations for filled flag, point type, texture ID, and visible
faces
- Chunk creation, voxel insertion, and retrieval
- Chunk manager for handling multiple chunks

The only adjustments needed were minor testlevel fixes (parentheses for
operator precedence and explicit tuple types for spread arguments). The core
engine code (`voxel_engine.ts`) is solid and ready for the next stage.

You can now proceed with the WebGL rendering layer whenever youre ready. If
youd like help with that, or need any modifications to the current data
structures, just let me know!