bug(semantic): Export equals declaration not counted as a `Read` reference

> Found by #4445
Correct, counts as a `Reference::Read`
<img width="1467" alt="image" src="https://github.com/user-attachments/assets/8aa1103a-88c4-4fab-9442-bdf74667fa69">

Incorrect, does not count as a `Reference::Read`
```ts
type Foo = number
export = Foo
```
<img width="1467" alt="image" src="https://github.com/user-attachments/assets/9d7f9361-2402-4770-a414-532ff1b55407">
