Main took hayro-syntax patches 26 and 27 (xref streams), so the patch
that keeps up to 256 operands per instruction moves to 28 in
vendor/README.md and in every comment that cites it.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0175FWj4xFhMhSH3UpMU8DSC