Changes in version 1.0.0 (2026-05-25)                  

  - Added plot_EC50_curves() for plotting raw dose-response observations
    and fitted drc curves across isolates, strata, and one or more
    candidate models.
  - estimate_EC50() and ec50_multimodel() now store plotting metadata
    and fitted models, allowing plot_EC50_curves(fit) without repeating
    the formula, data, grouping columns, or model functions.
  - Added ec50_estimates(), ec50_metadata(), fitted_models(), and
    curve_data() helpers for working directly with fitted EC50 objects.
  - Added workflow helpers for model selection, fit quality, failed
    fits, prediction, reporting, data checks, and residual diagnostics.
  - Reorganized pkgdown and vignettes around the user workflow: check
    data, fit models, diagnose fits, select models, plot curves,
    predict, and report.
  - Added a new getting-started vignette and rewrote the single-model
    and multimodel vignettes to emphasize fit objects as the main
    interface.
  - Removed row-name warnings from predict_ec50() and residual_data().
  - Added clearer validation for formula, response, and dose inputs,
    including stable empty outputs when no groups can be fitted.
  - Reset row names in extractor outputs and preserved model-selection
    columns for all-failed multimodel fits.
  - Made quiet = TRUE suppress informational messages from internal drc
    fitting calls.
  - Added a clear error when plot_EC50_curves() is asked for models =
    "best" without a fitted ec50_multimodel object.
  - Modernized EC50 estimation internals with shared validation, clearer
    errors, and warnings for failed isolate-level fits.
  - Kept runtime dependencies focused on drc and ggplot2.
  - Removed vignette-only dependencies on cowplot and ggridges.
  - Added support for type = "relative" and type = "absolute" in
    estimate_EC50().
  - Added automated tests for grouped estimates, argument validation,
    absolute effective-dose levels, and multimodel output.
  - Converted the example dataset to standard package data format.
  - Refreshed the vignette, README, and pkgdown configuration.