Changes in version 0.0.3 - Updated graph construction to use sparse k-nearest-neighbor matrices. - Enforced degree-weighted centering constraints in the ADMM delta updates through sparse KKT solves. - Added known-truth simulation outputs, selection-recovery summaries, expanded numerical tests, and improved plot colorbars. - Added root-level JSS replication materials for synthetic, blocked-CV, comparison, and Lucas County sample examples. Changes in version 0.0.2 - Strengthened input validation, fold-wise adaptive-weight estimation in blocked cross-validation, and inverse-distance extrapolation for predict(..., k > 1). - Added a reproducible comparison section for the JSS replication material. Changes in version 0.0.1 - Initial package scaffold for sparse-smooth spatially varying coefficient quantile regression. - Added ADMM fitting, prediction, spatially blocked cross-validation, graph construction, simulation helpers, and KKT diagnostics. - Added tests, vignettes, a Lucas County sample data set, CI configuration, contribution guidelines, and a JOSS paper draft. - Added a standard plot() method for fitted model objects in line with JSS expectations for R packages returning compound objects.