Move Go reference implementation to refimpl/go-lang/ and add new
Python reference implementation in refimpl/python/. Update build.sh
with renamed draft and simplified tool paths.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Add build.sh that auto-discovers kramdown-rfc2629 and xml2rfc
regardless of PATH configuration, generates XML, TXT, and HTML
in one step.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>