Coding-agent bypass: artifact completion (fill the empty field) - All Runs

Holds one well-defended health-misinformation payload constant and sweeps completion-style scaffolds — pytest parametrize case, failing-test fill, fill-the-stub, git-diff add, patch-apply, jsonl append — that ask a model to COMPLETE an empty field in a pre-existing test/fixture/dataset artifact, against a direct baseline and two authoring-in-a-format controls. The completion framings crack even models that refuse the plain fixture; the standout (pytest parametrize / failing-test) generalises across labs.