Changes in version 0.1.0 (2026-05-12)                  

  - Initial release.
  - Added fit_modal_arima() for fitting Parametric Modal ARIMA models
    using the generalized SKD family.
  - Implemented S3 methods: print, coef, AIC, BIC, summary, and plot.
  - Added comprehensive simulation tests demonstrating parameter
    recovery (c, ar1, sigma, gamma).