A leading YAML frontmatter block used to render as goldmark's
thematic-break soup (hr + stray text). It now renders as a compact
table: keys in the author's order (yaml.Node, not a map), flat lists
comma-joined, nested values as compact YAML in <code>, everything
HTML-escaped. Anything that isn't a well-formed YAML mapping — mid-doc
fences, unclosed fences, list-shaped or invalid YAML — falls through
and renders exactly as before; empty frontmatter is simply hidden.
Applies everywhere the server renders markdown: the hub viewer and
public share pages, each with theme-matched styling. Matters most for
OKF/gbrain-style frontmattered knowledge bases.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01P5cxPQdSGJnjXCYY9GeWXt