permissions: models: read not recognized

There is a new permissions scope `models`

```yaml
permissions:
models: read
```

https://docs.github.com/en/github-models/integrating-ai-models-into-your-development-workflow#using-ai-models-with-github-actions

Start by tracing how this VS Code extension parses or validates GitHub Actions workflow permissions, using the linked GitHub documentation to confirm the models scope. Done means a workflow containing permissions.models: read is recognized without an unsupported-permission error; the payload does not name a file or test to run.

索引モデルが issue の本文から書いたものです。