Add an llms.txt section to the shared mcp-server-setup snippet
so /coding-agent-setup and /coding-agents pages tell users
where to find it for tools that don't speak MCP.
SSE transport is no longer available. Update all MCP server setup
instructions to use HTTP transport with the /mcp endpoint, and
remove the Tadata callout.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>