Changes in version 0.1.0                        

Submission-readiness update

  - Correct seasonal-amplitude scaling: log models now report the
    peak-to-trough seasonal-factor range in percentage points, level
    models use the additive range relative to the median absolute level,
    and unavailable components produce NA rather than zero.
  - Render unavailable QS diagnostics explicitly in the existence and
    engine-choice cards instead of producing incomplete labels or
    errors.
  - Surface SEATS model substitutions in the report summary and
    engine-choice card. The candidates table now records a stable switch
    indicator alongside the requested and operative model
    specifications.
  - Add comparison_mode = "incumbent_fixed" for ARIMA comparisons that
    retain the incumbent transformation, fixed outliers, calendar terms
    and stored user regressors. Candidate metadata and reports identify
    the comparison design and regressor differences.
  - Fix include_easter = "auto" so X-13 tests and selects the Easter
    effect instead of always imposing easter[15]. Candidate metadata and
    HTML reports now show the Easter window actually retained by the
    fitted model.
  - Make sa_should_switch() compare the selected candidate directly with
    the incumbent. Identical adjustments are kept, a change requires a
    material comparable AICc improvement without diagnostic regression,
    and missing or non-comparable evidence is reported explicitly.
  - Freeze core user-facing API for the 0.1.x pre-submission
    stabilization cycle.
  - Add contributor and governance documentation (CONTRIBUTING.md,
    CODE_OF_CONDUCT.md).
  - Add package citation metadata via inst/CITATION.
  - Add initial rOpenSci statistical-review standards mapping with a
    bronze-first target.
  - Clarify positioning versus alternatives in README and
    getting-started vignette.

                        Changes in version 0.0.1                        

  - Initial development release.