Note

Expose MCP server initialization info via MCPServer.server_info, populated from ClientSession.initialize(); add tests.

• MCP:
  • Add _server_info: mcp_types.Implementation to MCPServer and expose via server_info property (raises until initialized).
  • Update __aenter__ to capture initialize() result and set self._server_info = result.serverInfo.
• Tests:
  • Add test_server_info to assert server_info unavailable pre-init and populated post-init.

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