0.19.0

• Bilibili: video subtitle/transcript extraction (#271)
• ChatGPT: preserve citation footnotes (#311), fix content after Thought sections (#302)
• CLI: --frontmatter flag for YAML metadata output (#313), --user-agent flag for fetched URLs, read HTML from stdin (#192)
• Math: reconstruct MathML from MathJax CHTML render tree (#250), fix Markdown conversion for complex and aligned math (#301), flatten tagged single-equation tables so they render horizontally
• Tables: preserve trailing columns in ragged tables (#299)
• X/Twitter: prefer async extraction in Node for X articles (#318), fix non-English aria-label reply extraction (#290), fix FxTwitter facet indices for surrogate-pair emoji (#281)
• YouTube: fetch videoData from a more reliable source (#211)
• Fix: don't mutate the live document in parse()
• Fix: don't strip sections with delimiter-less anchor ids (#303)
• Fix: author/date byline heuristic no longer matches day-of-week as a date (#291)
• Markdown: encapsulate links with spaces (#278)
• Remove subhead (#316); remove <style> from SVGs for security
• Add CI; dependency upgrades (esbuild, mathml-to-latex, temml)