[WIP] Extract stylelint plugin and config for composes files

[Copilot]

Extract Stylelint Plugin and Config for Composes Files

Source: github/github-ui PR #12802

Status: Need access to source PR

The source PR (https://github.com/github/github-ui/pull/12802) is in a private repository that I cannot access directly.

What needs to be extracted:

Based on the task description, I need to extract:

• Stylelint plugin code for validating CSS Modules composes usage
• Stylelint configuration changes to enable the plugin
• CSS file changes that demonstrate or require the plugin
• Any tests for the stylelint plugin
• Documentation for the plugin

Next Steps:

Option 1: User provides access or shares the relevant files from PR #12802
Option 2: User copies the specific code/files that need to be extracted into this repository
Option 3: User provides the diff or patch from PR #12802

Once I have access to the source material, I will:

1. Create the stylelint plugin structure in this monorepo (likely at packages/stylelint-plugin-primer-react/)
2. Extract and adapt the plugin code
3. Update stylelint configuration to use the plugin
4. Extract any relevant CSS changes
5. Add tests and documentation
6. Ensure it follows the monorepo pattern established in PR Move eslint-plugin-primer-react into monorepo #7514

Questions:

• Can you provide the code from github/github-ui PR #12802?
• Should the plugin be created as a new package in the monorepo?
• Are there specific CSS files that need the composes validation?

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