Organize wiki into topic CMS collections while preserving URLs

[nschimme]

Changes

Replace the single large Pages CMS collection with 12 topic groups and 54 alphabetic leaf collections for 1,150 articles. Keep every existing /wiki/pages/<Filename> URL, cross-link, tag, alias and legacy redirect. GitHub edit/create links target the physical source folders. Add reader breadcrumbs, topic listings, production canonical URLs and non-indexable previews without duplicate hierarchical article URLs.

Enable Markdown WYSIWYG editing with an Editor/Source switch and update contributor instructions. Use Source mode for spoilers, includes, HTML, scripts and components. Article content is unchanged apart from include-path adjustments and the contributor-guide update.

Optimize autolinking with precomputed URL-to-term lookups and one lowercase conversion per text node. One comparison with the same Docker/Node CPU-profiler settings measured 156.04 → 78.69 seconds (49.6% faster); runtime varies.

Validation

• Docker builds and browser checks at /wiki/, /, and /wiki/pr-99/.
• All 1,150 original URLs, heading IDs, titles, descriptions, tags and aliases compared with the original build. Production canonical URLs and sitemap entries match unchanged routes without physical-folder duplicates.
• Permanent prebuild tests and dead-link/anchor validation pass.
• Browser checks covered article loading, breadcrumbs, search, topic navigation, physical GitHub edit/create paths and legacy MediaWiki redirection. Preview output had no sitemap and included noindex, nofollow.
• All 1,149 unchanged article bodies rendered identically after autolinker optimization; the contributor guide was intentionally updated.

Remaining live checks

Pages CMS cold loading/reloading, trusted-editor saves/new-page creation, special-Markdown WYSIWYG round trips and deployment remain unverified. Check all leaf collections, including the oversized Shaman Guide and empty Classes collection, and record results in this PR.

[sourcery-ai]

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