Exercises the real export pipeline against the bundled JetBrains Mono TTFs:
- PdfFontHeader emits valid xelatex fontspec with correct family + Ligatures=NoCommon
- ExportCss.build emits @font-face with base64 data URI
- DocxFontEmbedder injects TTFs into pandoc-produced DOCX (word/fontTable.xml + word/fonts/)
- EpubFontEmbedder.patchManifest adds TTF entry to OPF <manifest>
- HTML export links the sidecar CSS which embeds the font
Run with: node tests/smoke-e2e-monospace.js