CI's base test job installs the library without that extra, so the test died on
`import transformers` before reaching a single assertion. It monkeypatches the
Z-Image and SAM loaders rather than calling them, but the modules still have to
be importable to be patched, so pytest.importorskip is the right gate: the guard
still runs everywhere the extra is present and skips where it cannot.
Local runs could not have caught this - the dev environment has the extra.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
