Add importance scoring methods, update CLI argument parsing, fix error message typos, enhance PLY saving with decimation support, correct CGAffineTransform typo, document new CLI usage.

Implement swift wrapper for SHARP inference, add model support for `.mlpackage`, `.mlmodel`, `.mlmodelc` with caching, enhance image preprocessing to `[0,1]` range, improve PLY output with coordinates/color/logits, validate inputs/outputs, optimize CLI usage with focal_length default.