Idea: Lint against roles being set unexpectedly

E.g.

```

```

These all seem very inappropriate. Could we lint against (some) roles being set?

Start by reviewing the repository’s existing lint rules and test layout, then compare the listed role examples with the project’s accessibility guidance. The issue does not define which roles are prohibited or how exceptions should work, so confirm that scope before coding. Done means the agreed invalid role assignments are detected with tests covering the examples.

索引モデルが issue の本文から書いたものです。