Documentation for MCP Apps does not match 2026-07-28 specification

[symdeb]

The specification and documents still refers to "initialize"
It does not describe out how to add the ui extension in the client request for capabilities _meta structure per client call for the 2026-07-28 specification

https://github.com/modelcontextprotocol/ext-apps/blob/main/specification/2026-01-26/apps.mdx

{
  "method": "initialize",
  "params": {
    "protocolVersion": "2024-11-05",
    "capabilities": {
      "extensions": {
        "io.modelcontextprotocol/ui": {
          "mimeTypes": ["text/html;profile=mcp-app"]`