qqkrls 1.0.0

• Initial CRAN release.
• qqkrls() implements Quantile-on-Quantile Kernel-Based Regularized Least Squares (Adebayo et al. 2024) by fitting KRLS::krls on conditional sub-samples and summarising pointwise marginal effects across quantiles, with paired-bootstrap standard errors.
• 3D surface, heatmap and contour visualisations (plot_qqkrls_3d, plot_qqkrls_heatmap, plot_qqkrls_contour).
• MATLAB Parula default colour scale, plus Jet, Turbo and BlueRed.
• Helpers qqkrls_to_matrix(), qqkrls_export().