Changes in version 0.1.0 (2026-03-19)                  

Initial release

  - First public release of the achieveGap package.
  - Implements hierarchical penalized spline models for estimating
    achievement gap trajectories in longitudinal educational data.
  - Provides the main function gap_trajectory() for fitting joint
    mixed-effects spline models with REML smoothing selection.
  - Includes simultaneous confidence bands based on posterior
    simulation.
  - Supports visualization and summary methods for estimated gap
    trajectories.
  - Includes simulation utilities for benchmarking model performance.