A file's place inside a run's .artifacts/<RunId>/ folder: /-separated, never absolute, never carrying a parent-directory step.
Content, like a filename, so its Debug redacts. It is a statement of where to look, never an authority to look there: the register path rule (staging::stage) still resolves it, walks it for links and proves containment. Refusing the obvious faults here as well means a listing this type could not have produced can never be echoed back as a registration.