New rule: Ban top-level querying in module.

Querying should be wrapped in event listeners such as `document.addEventListener('DOMContentLoaded', ...)` or a Web Component.

## 👎🏻 Examples of bad code.

```js
const el = document.querySelector('.my-element')
```

## 👍🏻 Example of good code.

```js
document.addEventListener('DOMContentLoaded', function() {
const el = document.querySelector('.my-element')
})
```

The issue names no files, tests, or entry points. Start by locating the repository's existing ESLint rule definitions and their tests, then compare how they detect top-level queries and report violations. Done means the new rule rejects the shown module-level query while allowing querying inside a DOMContentLoaded listener or Web Component.

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