What is the problem you're trying to solve?

I want to enforce consistent naming conventions for my layer names.

@layer foo {};
@layer bar;
@import "foo.css" layer(baz)

Ref: #7732 (comment)

What solution would you like to see?

A new rule:

• Name: layer-name-pattern
• Description: Specify a pattern for layer names.
• Message: Expected "${name}" to match pattern "${pattern}"
• Primary option: string|regex
• Secondary options: None
• Category: Enforce conventions > Patterns
• Autofix?: No
• Included in sharable configs?: Yes (kebab case)
• Expanded description: N/A

Do we want to check the whole layer name or split the period-separated list of <ident>s first?:

@layer framework.theme {}

My hunch is that we should check the whole name, as we can add a separate rule for enforcing specific idents, e.g., layer-name-ident-allowed-list: ["base", "framework", "theme"]. The layer-name-pattern is for users wanting to enforce a general pattern, e.g. kebab case, without enforcing specific names.