hairline 0.1.0

• First release.
• One frame for titles, legends, panels and captions around any ggplot (theme_hairline()), with the type scale, spacing and line widths of the shared design tokens.
• Nineteen charts, from bars and time series to Kaplan-Meier, forest, Sankey and PRISMA diagrams.
• hl_study() with endpoints for cohort description, group comparison, effects, survival and change over time; each returns a figure, a table, values and a sentence.
• Brands in the ‘brand.yml’ format, entity colours pinned to names, colour-vision checked palettes, light and dark schemes.
• hl_save() for PDF, PNG, TIFF, SVG and interactive HTML; files are named by the figure and carry no timestamps.
• Output matches the ‘hairline’ Python package.