Detailed design + process for upgrading the CMS wiki: rich-text (TipTap) editing, server+client sanitization, categories, drafts/publish, tags, internal links/backlinks, inline images, FULLTEXT search, and revision history. Staff-only (admin/editor). Additive, idempotent schema migration. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>