What's the problem this feature will solve?

PR #3687 (fix for #3412) added a hard Fail in Pep517VenvPackager._setup_env() that rejects any deps on PEP-517 packaging environments. This broke two downstream consumers:

tox-uv — Tests for editable-legacy, workspace, and no_pyproject scenarios set deps = wheel on .pkg because uv doesn't seed wheel into venvs by default (unlike virtualenv). The editable-legacy flow needs wheel importable in the packaging venv for setup.py develop. CI: https://github.com/tox-dev/tox-uv/actions/runs/22071221669

@ wshanks (qiskit-experiments) — Uses package = external with deps = build on .pkg to run python -m build for sdist→wheel workflow. Discussion: #3491 (reply in thread) Fix PR: qiskit-community/qiskit-experiments#1615

Describe the solution you'd like

1. Only raise the error when call_require_hooks is a subset of {"sdist", "wheel", "editable"} (standard PEP-517 types). Allow deps when editable-legacy or external is involved
2. Add a new package type that does: build sdist -> build wheel from that sdist, natively

Alternative Solutions

Additional context