Enhance Tool, BinItem, and MultiBin classes with:
- Input validation in constructors and property setters
- Guard clauses for invalid states (negative values, empty names)
- Business logic methods (CanFitItem, CalculateWaste, etc.)
- Proper encapsulation with backing fields
- Comprehensive XML documentation
- Override Equals/GetHashCode for value semantics
- Better ToString() implementations
These changes enforce business rules at the domain level and prevent
invalid states from being created.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
