## Problem
The discontinued AG-UI protocol mirror remained published on
docs.copilotkit.ai. Its sitemap advertised pages owned by the separate
AG-UI repository, including eight routes that returned 500.
## Why
The protocol documentation is maintained at docs.ag-ui.com. Keeping an
unsynchronized duplicate on the CopilotKit host created broken
user-facing URLs and misleading search results.
## Fix
Remove the vendored `/ag-ui/*` content, renderer, sitemap/search/LLM
enumeration, and mirror-specific tests. Retain CopilotKit's own AG-UI
integration documentation under `/backend/ag-ui` and
`/agentic-protocols/ag-ui`.
Validation: `npm run typecheck`; focused Vitest suite (39 tests).
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **Documentation**
* AG-UI protocol documentation has been removed from the documentation
site.
* AG-UI documentation updates are now directed to the upstream protocol
project.
* Related guides, SDK references, drafts, roadmap, integrations, and
contribution pages are no longer available here.
* **Search & Navigation**
* AG-UI pages no longer appear in search indexes, sitemap listings, or
LLM-generated documentation content.
* Documentation routing now resolves supported content areas without the
former AG-UI route.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Tyler Slaton
3e86b8d559