- Use lazyregexp for linkifyURLRegexp to avoid compile-at-init overhead.
- Replace stdlib log with clog/v2 and return HTML-escaped body on
conversion error instead of nil.
- Handle absolute URL prefixes in linkTransformer using net/url to
preserve scheme and host.
- Remove goldmarkhtml.WithUnsafe() from RawMarkdown renderer options.
- Use exact assertions in autolink tests instead of Contains.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>