Initial public release of the Wnet model

Initial release of the Wnet model for predicting subgrid-scale variability, including associated analysis and prediction utilities.

This version includes:

Core model code and configuration files

Preprocessing and postprocessing scripts

Utilities for SHAP analysis and figure reproduction

Documentation and example workflows

Full Changelog: https://github.com/dbarahon/Wnet/commits/v1.0.0