[0.4.2] - 2026-06-14

Changed

• Documentation: Comprehensive README.md improvements including:
  • Added Citation section with in-text academic citation templates and BibTeX references
    for citing the package in research papers.
  • Added Minimal Example demonstrating end-to-end workflow with split_by_date(),
    fit(), optimize(), visualize(), transform(), and evaluate() methods.
  • Improved Visualization section with side-by-side comparison of three representative
    optimization methods (Empirical, Monotone, Monotonicity-Convex-Concave) using horizontal layout.
  • Resized visualization images for optimal display in documentation.
  • Simplified English language throughout Features, Usage, and method descriptions for clarity.
  • Created comprehensive Japanese README (# RFScorer (日本語README)) with complete
    translation of all explanatory text while preserving code examples and diagrams exactly.
  • Aligned English and Japanese versions to ensure consistent technical terminology
    (product-choice probabilities, optimization methods, feature descriptions).