StageFault held a slice into PlanEntry.path, documented as borrowing a plan that outlives the call. It does not: applyCheckin frees the plan from its own defer on the way out, so the caller rendered freed heap -- ten bytes of garbage where a filename belonged, in the very diagnostic added to make this failure legible.

Path is copied now, as the artifact name already was. Adds the end-to-end test that would have caught it: the earlier test hand-built a fault and so never exercised the lifetime that was wrong. check-in: 41dc7067d8 user: dmestas tags: sub-manifest