Function process 

pub fn process<P: AsRef<Path>>(
    path: P,
    max_depth: usize,
    progress: Arc<ScanProgress>,
    exclude_patterns: &[Pattern],
    scan_strategy: &ScanStrategy<'_>,
) -> Result<ProcessResult, Error>

Scan a directory tree and produce ProcessResult entries.

This traverses files/directories up to max_depth, applies exclusion patterns, extracts metadata, and performs license/copyright parsing.