The packed rehearsal now names each stage on the child's stdout and bounds the
manager's removal, so an operation that never settles reports the profile lock
and the still-live pnpm process instead of only a test timeout. That evidence
located pnpm 11.7.0 leaving its worker pool alive after a short-circuit return
(pnpm issue 12297, fixed in 11.23.0 and carried by this stack's base).
Three attempts to keep pnpm off that path — a private pnpm store, installing
both bundles before removing either, and pre-declaring the profile's age
exemptions — did not change the outcome, so none of them remain.