- Replace test_all_install_podman with test_none_install_podman: agent
images intentionally no longer include podman; the nested-containers
derived layer is where it lives (see build_image in nested_containers.py).
- Add podman to the package assertions in test_macos_nested_containers so
its presence in the derived Dockerfile is explicitly verified.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>