Function collect_files 

pub fn collect_files(
    base_path: &Path,
    filters: &[String],
    ignores: &[String],
    auto_ignores: &[String],
) -> Result<Vec<DirEntry>>

Collects all files to be processed using ignore crate for efficient traversal.

auto_ignores are runtime-computed exclusion patterns (e.g., the tool’s own output file or cache directory). They are processed identically to user ignores but kept separate to avoid polluting user-facing configuration.