Extract rule: template-splat-attributes-only

[NullVoxPopuli]

Split from #2371.

[NullVoxPopuli-ai-agent]

Review: template-splat-attributes-only

Compared against ember-template-lint splat-attributes-only.js.

General Correctness

1. Faithful port: This is a clean, minimal rule and the ESLint port matches the original perfectly. The original checks AttrNode where node.name.startsWith('...') and node.name !== '...attributes', and the port does exactly the same with GlimmerAttrNode. The error message matches. Well done.

2. Error message: Matches the original exactly: 'Only \...attributes` can be applied to elements'`. Good.

3. Tests: Cover the main cases. The hbs tests include ...arguments as invalid. The gjs tests additionally test ...props. Good coverage.

4. No issues found: This is a straightforward structural check with no edge cases to worry about.

Scope Analysis (gjs/gts)

This rule only checks attribute names (structural/syntactic property). It does not match any helper or component names. No scope analysis needed.

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🤖 Automated review comparing with ember-template-lint source