Test: Add a comment to validate-dotfiles workflow

@claude Please add a simple comment to the `.github/workflows/validate-dotfiles.yml` file at the top that says:

```yaml
# Test comment to verify workflow modification permissions
```

This is a test to verify that Claude can now modify workflow files after PR #1177.

**Requirements:**
- Add the comment as the first line of the file
- Create a PR with this change
- Use conventional commit message format

This is issue #1168 test case.

Open .github/workflows/validate-dotfiles.yml and verify its current first line. Add the requested comment as line one, then create a PR using a conventional commit message; done means the file contains that exact comment at the top and the PR is opened.

Written by the indexing model from the issue text.