Replace ~200 lines of inline SSG logic (types, accessors, parsing,
sorting, tags, file I/O) with imports from the new ssg package.
Sync updated Lyceum article, images, snippet, and CSS fixes
(h3/h4 font-bold, ol list-decimal, blockquote/li spacing) from
blu-elmstatic.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
