adjust_contrast_pair    Adjust Contrast Between Two Stroke Colors
geom_curve_dual         Dual-Stroke Curved Line Annotations
geom_function_dual      Dual-Tone Curved Function Lines
geom_lm_dual            Dual-Tone Regression Line with Contrast-Aware
                        Strokes
geom_path_dual          Draw dual-stroke paths with side-by-side
                        colours
geom_segment_dual       Dual-Stroke Line Segments with Side-by-Side
                        Offset
geom_text_contrast      Contrast-Aware Text Geom
highlight_colors        Generate a high-contrast, well-separated
                        highlight palette (global search)
highlight_info          Inspect effective palette constraints
