`export` modifier on `enum` disables `This condition will always return * ts2845`

### 🔎 Search Terms

export enum ts2845

### 🕗 Version & Regression Information

5.4 doesn't flag it without the `export` modifier either.

### ⏯ Playground Link

https://www.typescriptlang.org/play/?target=99&module=0&ts=6.0.0-dev.20260416#code/KYDwDg9gTgLgBMAdgVwLZwIIBMCGYbBQDyyMYpAKgJ5jBwDeAUHJgAqsD6rGA4gKIAaZnG78AykIC+jRlmABjADY4odeREQBneDBrAAXJlz5CJMpT0z1W+AGsAloixwAvMN21XLl0bwFipOQw1LQAdBjsXLx8cAA+sb4mAebBeqGifGLCLAD0OSwFhUXFJaUUABb2mnDWWPYw9hpwAO72iopwOIrNOFTVqjDIUIhwAOQwUMjAo6EAFABMABwALACsAJTZcAD8Y4rAAGYwo1uGo1D2AOblxwDcQA

### 💻 Code

```ts
// remove `export` modifier
export enum AdapterOutputType {
APP_PAGE,
PAGES,
}

declare const type: AdapterOutputType

const kind =
type === AdapterOutputType.APP_PAGE || AdapterOutputType.PAGES
// ~ should be flagged with: This condition will always return 'true'.(2845)
? 'left'
: 'right';
```

### 🙁 Actual behavior

No typechecking error

### 🙂 Expected behavior

`ts2845` because the condition is always `true`.

### Additional information about the issue

_No response_

Start by reproducing the linked TypeScript Playground case, then compare the diagnostic behavior with and without the `export` modifier on `AdapterOutputType`. Trace the type-checking path for the enum member comparison and verify that the erroneous condition receives TS2845 without introducing a diagnostic for the valid case.

Written by the indexing model from the issue text.