chore(refactor): unless -> if not

[itamm15]

Description

https://hexdocs.pm/elixir/1.18.0/Kernel.html#unless/2

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
• 🔧 Refactoring (no functional changes, no api changes)
• ⚡ Performance improvement
• 🧪 Test coverage improvement

Changes Made

Testing

• All existing tests pass
• New tests added for new functionality
• Manual testing performed (describe below)

Manual Testing Details

Context Integration

• This change affects Contexted.Tracer functionality
• This change affects Contexted.Delegator functionality
• This change affects Contexted.CRUD functionality
• This change affects compilation behavior
• This change affects migration/setup process

Documentation

• README.md updated (if needed)
• Inline code documentation updated

Breaking Changes

Additional Notes

Checklist

• My code follows the project's style guidelines
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• 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