Module fetch 

Download orchestration: GitHub release → progress bar → safe extraction.

This is a thin glue layer (~30 lines of logic) that wires github::release_asset_body → indicatif::ProgressBar::wrap_read → tarball::extract_safe. It has no test file of its own — its behavior is exercised by the integration tests in Units 8b and 9.

Functions

download_and_extract

Download a release tarball and extract it safely into target.