Spoke produces unoptimized textures that have a larger file size than the source textures

For example, the GLTF from Sketchfab for this model contains a JPEG base color texture that is 522KB, but the same texture is 1.28MB when published from Spoke
https://sketchfab.com/3d-models/lamp-vintage-8d0e4151b9004821bac7486e95e73b84

Start by reproducing the published GLTF using the linked Sketchfab lamp model and compare its source JPEG texture with the texture produced by Spoke. Trace the texture publishing path to identify why the output is larger; done means published textures are no larger than the source while preserving the model appearance.

Written by the indexing model from the issue text.