[0.2.4] - 2026-06-07

Changed

• plot_probability_surface() now returns a matplotlib.figure.Figure instead of saving directly to a file.
  In Jupyter Lab and Colab the returned figure renders inline automatically.
  To save to a file, call fig.savefig("output.png") on the returned figure.

Removed

• path parameter from plot_probability_surface().
  File saving is no longer handled by the method; use fig.savefig() instead.

Added

• Tests for plot_probability_surface() covering all three kind values and error cases.