MarkdownPDF 0.2.0

Added

• Draw math symbols (operators, relations, Greek, arrows: \sum -> ∑, \pm ->
  ±, \sigma -> σ, and so on) with their real Unicode glyphs when the active
  embedded font covers them, falling back to the ASCII transliteration per
  symbol only where the font has a gap. Previously every symbol used the ASCII
  transliteration. The portable base-14 profile still renders all-ASCII (it
  covers no math glyphs), so its output is unchanged; an embedded math-capable
  font now matches a web/SVG render of the same source. Consumes the
  MathTypeset 0.5.0 unicodeWhereCovered symbol style, with the embedded
  font's cmap answering coverage.
• Parse TeX horizontal spacing commands in math (\quad, \qquad, \,, \:,
  \;, \!, and \ ) through MathTypeset 0.6.0. Previously any of these forced
  the whole formula to fall back to visible source; the math-handbook showcase
  rows that use \qquad now typeset.
• README gallery of real rendered PDF pages, a four-panel hero banner
  (multilingual text, native charts, a Mermaid diagram, and mathematics), and a
  dedicated Mathematics showcase cell drawn from the scientific-article fixture.

Changed

• Tolerate a zero-height MuPDF line in the character-quad witness the same way
  the per-glyph check already does (#197): a line made only of legitimately tiny
  nested sub/superscript glyphs (a_{i,j}^{n+1}, 2^{2^{x}}) can report a
  zero-height quad. Only a clearly negative (flipped) line height is a defect;
  zero or negative width still fails.
• Retire the completed child issues from the in-progress roadmap diagrams
  (Current Hardening and Math typesetting), keeping each diagram focused on the
  work that remains. Every epic stays visible as a node in the Epics overview.