This patch release fixes critical issues and adds testing infrastructure.

- Added missing markdown support to Nuxt configurations (forNuxt, forNuxtModules)
- Fixed MD024 rule configuration for CHANGELOG.md to allow standard changelog format
- Fixed type compatibility between Config and Linter.Config types

- Added example workspaces for real-world testing:
  - playground-standard: Basic JavaScript/TypeScript projects
  - playground-nuxt: Nuxt.js applications
  - playground-nuxt-module: Nuxt module development
- Created automated tests to verify consistent rule application
- Enhanced test script with proper workspace preparation

- Extended clean script to handle example workspace artifacts
- Improved test reliability with dev:prepare integration
- Added Node.js globals for test files

All project types now have consistent markdown linting with proper
enforcement of our custom rules (4-space indentation, 80-char lines).