Support stdio transport server on the session/new request in the acp mode.

[Angeart]

Describe the bug

Agent Client Protocol says All agents MUST support this transport but Copilot CLI has Rejected these stdio servers.

Affected version

GitHub Copilot CLI 1.0.63

Steps to reproduce the behavior

1. Create ACP Client and it connect to Copilot CLI
2. request a session/new request with mcpServers config include the stdio transport servers.
3. Copilot CLI will rejected these stdio servers. (I discovered Copilot CLI says reject in the process log)

Expected behavior

These will launch correctly stdio transport MCP Servers via session/new request

Additional context

Currently workaround:
mcpServers config pass to copilot cli via --additional-mcp-config=JSON args, these works fine.

Is that the behavior correct?

thanks.