Function encode_voxj_file 

pub fn encode_voxj_file(
    file: &VoxjCodecFile,
    position: PositionEncoding,
    sample: SampleEncoding,
) -> Result<VoxjSerdeFile>

Encodes a VoxjCodecFile (decoded geometry) into a VoxjSerdeFile (encoded .voxj blocks) with fixed position and sample encodings, ready to serialize with to_voxj_file_bytes. Each object’s palette cell counts come from the palettes it references; the palettes, hierarchy, roots, and ext carry over unchanged. Errors if an object references a palette outside the document’s palettes.