Home: add grouped Pages index (in case the sidebar is missed)
Add wiki pages (Auth, Data/Auditing, Deployment, CI/CD, Config, Testing, Design Decisions, Troubleshooting) + _Sidebar nav
Rewrite Rate Limiting page: simple but professional and technical
Add plain-English Rate Limiting page; link from Architecture
Fix Mermaid diagrams (sequence + flowchart parse errors)
Add Architecture page; link it from Home
Updated Home (markdown)
Home: link to the Setup guide
Initial Home page
Initial setup-wiki page