MCP enum prevents using `MCP` package namespace in client code

**Describe the bug**

The `MCP` enum prevents explicitly referencing MCP types via the package namespace

**To Reproduce**

For example:

```
import MCP

class MyService {
   typealias Client = MCP.Client // does not work because MCP enum clashes with the package name
}
```


**Expected behavior**

Package types should not clash with the package namespace
