Function run_src2md_on_path 

pub async fn run_src2md_on_path(
    project_root: PathBuf,
    output_path: PathBuf,
    ignore_file: Option<PathBuf>,
    extensions: &HashSet<String>,
    fail_fast: bool,
) -> Result<()>

Generate a Markdown file from a specific directory path.

This is a convenience function that creates a Config and runs src2md. Useful when you have a path (e.g., from a cloned git repo) and want to process it without constructing a full Config.