A clean, production-ready report engine for .NET Framework 4.5.2+ that converts SQL result data into business-friendly Excel, HTML, and CSV reports with human-readable formatting. Features: - Fluent API for defining reports - Support for DataTable and List<Dictionary<string, object>> - Multiple output formats (Excel, HTML, CSV) - Business logic layer for grouping and calculations - Currency formatting with custom rules - "Explain Like I'm Five" report summaries - Clean separation of concerns - Enterprise-ready code quality