glyph 0.1.0

• Initial CRAN release.
• Core spec builder with quosure-based aesthetic mappings (no aes() required).
• Eight mark types: mark_point(), mark_line(), mark_bar(), mark_area(), mark_text(), mark_rule(), mark_ribbon(), mark_link().
• First-class interactivity via interact(): tooltips, zoom, brush selection, hover effects, cross-filtering, and named selections.
• Declarative animation via animate(): entrance transitions and keyframe animation through data states.
• Unified scale system via scale() with convenience wrappers scale_color(), scale_log(), scale_time().
• Token-based theming via theme_tokens() with five built-in presets: light, dark, minimal, publication, presentation.
• Built-in layout composition via compose(), marginals(), inset(), and facet().
• Multi-backend compilation pipeline with auto engine selection based on data size (HTML/D3, Canvas, WebGL).
• JSON spec export via export() and Vega-Lite interoperability via to_vegalite().
• D3.js v7 rendering engine via ‘htmlwidgets’.