Changes in version 0.1.0 (2026-08-26)                  

  - Initial CRAN release.
  - progression_ratios() computes progression ratios from historical
    grade-level enrollment, with mean, geometric, median, last, and
    weighted summaries. It warns about calendar-year gaps across the
    complete supplied history before n_years selects the most recent
    transitions.
  - progression_matrix() places ratios on the sub-diagonal of a square
    projection matrix, leaving the entry-grade row at zero.
  - project_enrollment() advances a base enrollment vector over an
    arbitrary horizon, from either ratios or a prebuilt schedule,
    overwriting the exogenous entry grade each year. Missing schedule
    coefficients are preserved with an aggregate warning rather than
    imputed.
  - swing_schedule() builds per-year schedules that hold enrollment flat
    during swing years, apply recovery multipliers, then resume normal
    projection.