feat: enhance type checking for literals and generics

[Slashmsu]

🎉 Pull Request

Description

Type of Change

• 🐛 Bug fix (non-breaking change which fixes an issue)
• ✨ New feature (non-breaking change which adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality
  to not work as expected)
• 📚 Documentation update
• 🔧 Configuration/build changes
• ✅ Test improvements
• ♻️ Code refactoring (no functional changes)

Related Issue

Fixes #(issue number)

Changes Made

Testing

• All existing tests pass (npm test)
• Added new tests for the changes
• Tested manually with examples
• Linting passes (npm run lint)
• Type checking passes (npm run type-check)

Checklist

• My code follows the project's code style guidelines
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings or errors
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published

Additional Context

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📋 License Information

SomonScript is open source software licensed under the MIT License.

• License: MIT (see LICENSE file)
• Copyright: © 2025 LindenTech IT Consulting
• Contact: info@lindentech.de

By submitting this pull request, you agree that your contributions will be
licensed under the MIT License.

For contribution guidelines, please review:

• CONTRIBUTING.md - Community engagement and contribution
  guidelines
• AUTHORS.md - Project ownership and contributors

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Thank you for contributing to SomonScript! 🚀

[github-actions]

✅ Tests completed on Node.js 20.x: success

[github-actions]

✅ Tests completed on Node.js 20.x: success