Function process_with_baselines 

pub fn process_with_baselines(
    results: &[BenchResult],
    config: &ComparisonConfig,
) -> Result<Vec<ComparisonResult>, Error>

Process benchmarks with baseline comparison using CPD

This function:

1. Loads recent baseline runs (window-based)
2. Compares current results with historical data using statistical + Bayesian CPD
3. Saves new baselines
4. Returns comparison results