docs: Add JSDoc comment to type guard function

[garmeeh]

Summary

Add JSDoc documentation to the internal isNever type guard function in the stringify utility to improve code readability and maintainability.

Changes

• Added JSDoc comment explaining the purpose of the isNever function
• Marked the function as @internal to indicate it's not part of the public API
• Created patch changeset for this documentation improvement

Purpose

This is a test release to verify the complete release workflow:

1. ✅ PR checks (CI workflow runs)
2. ✅ Changeset validation passes
3. ✅ Branch protection with "All CI Checks" status
4. ⏳ Merge triggers Version Packages PR
5. ⏳ Merging Version Packages PR triggers NPM publish
6. ⏳ GitHub release created automatically
7. ⏳ Git tag pushed successfully

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Documentation (improvement to code comments or documentation)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

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