feat: papers site — wider layout, author handles, colophon, robust builds
UI changes:
- Widened max-width from 700px to 1100px (desktop 1100px, XL 1300px)
- Added @jeffrey author handle (pink) in meta-row for each paper
- Changed "r2" to "revision 2" for clarity, removed "est" prefix on dates
- Added colophon above footer describing the research platter, the oven build system, the cards format, and translations
Build fix:
- Changed xelatex/bibtex command chain from && to ; (semicolons) so bibtex warnings don't kill the build
- Check for PDF existence after build instead of relying on exit code — xelatex produces valid PDFs even when returning non-zero on warnings
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>