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.
