Implement unified trait for reports with comprehensive testing infrastructure

[Copilot]

This PR addresses the requirement to "Create a unified trait for the reports with unified testing" by implementing a comprehensive unified reporting system for the QQN optimizer benchmark suite.

Overview

The implementation introduces a Report trait that provides a consistent interface for all report types, enabling standardized report generation across multiple output formats with unified testing patterns.

Key Components Added

1. Unified Report Trait (src/experiment_runner/unified_report.rs)

• Common Interface: Standardized methods for content generation, validation, metadata, and file export
• Multiple Formats: Support for HTML, LaTeX, Markdown, and CSV output
• Configuration System: Flexible ReportConfig for customizing report generation
• Batch Processing: ReportCollection for generating multiple reports simultaneously

pub trait Report {
    fn name(&self) -> &'static str;
    fn description(&self) -> &'static str;
    fn generate_content(&self, data: &[(&ProblemSpec, BenchmarkResults)], config: &ReportConfig) -> Result<String>;
    fn validate_data(&self, data: &[(&ProblemSpec, BenchmarkResults)]) -> Result<()>;
    // ... additional methods
}

2. Unified Testing Infrastructure (src/experiment_runner/unified_report_tests.rs)

• Comprehensive Test Suite: UnifiedReportTestSuite validates any Report implementation
• Standardized Test Patterns: Consistent testing across all report types
• Test Data Generation: Utilities for creating mock benchmark data
• Format Validation: Ensures all supported formats generate valid content

The test suite validates:

• Basic functionality (name, description, supported formats)
• Content generation across all formats
• Data validation and error handling
• Metadata generation
• File export capabilities
• Format consistency

3. Example Report Implementations

• Summary Statistics Report: Demonstrates trait usage with existing functionality
• Performance Table Report: Shows detailed performance metrics implementation
• Both reports support all four output formats with format-specific optimizations

4. Integration Tests (tests/unified_reports.rs)

• Validates the unified trait system works correctly
• Tests multiple report types working together
• Ensures different reports produce different but valid content

5. Usage Examples and Documentation

• Example Module: Demonstrates practical usage patterns
• Comprehensive Documentation: Complete guide for usage and extension (docs/unified_reporting.md)

Benefits

1. Consistency: All reports now follow the same interface patterns
2. Extensibility: Easy to add new report types by implementing the trait
3. Quality Assurance: Unified testing ensures all reports meet quality standards
4. Multiple Formats: Single implementation supports HTML, LaTeX, Markdown, and CSV
5. Maintainability: Centralized testing and configuration patterns

Usage Example

use qqn_optimizer::experiment_runner::{ReportCollection, ReportConfig, ReportFormat};

// Create multiple reports with unified interface
let reports = ReportCollection::new()
    .add_report(SummaryStatisticsReport::new())
    .add_report(PerformanceTableReport::new());

// Generate all reports in HTML format
let config = ReportConfig {
    format: ReportFormat::Html,
    include_detailed_stats: true,
    ..Default::default()
};

let metadata_list = reports.generate_all(&benchmark_data, &config, &output_dir)?;

Backward Compatibility

The implementation maintains full backward compatibility with existing report functionality while adding the new unified interface. Existing report modules continue to work unchanged.

Testing

All new functionality includes comprehensive unit tests and integration tests. The unified test suite can validate any report implementation, ensuring consistent quality across all report types.

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