Place class/struct definition on the next line after template definition.

Example:
```cpp
template struct ISetter
{
virtual void Set(TValue value) = 0;

virtual ~ISetter() = default;
};
```
=>
```cpp
template
struct ISetter
{
virtual void Set(TValue value) = 0;

virtual ~ISetter() = default;
};
```

No source file, test, or entry point is named. Locate the transformer logic responsible for emitting the shown template and struct declaration, then verify its output against the before-and-after C++ examples; done means the struct starts on the line after the template declaration.

Written by the indexing model from the issue text.