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[P3] Consider waiting on child exit rather than on directory removal, so a contract-permitted purge failure does not cost ten seconds. The comment is right that purge failure is allowed ("the next spawn purges it again") and right that the tolerant wait plus the retrying
rmis safe — but the two facts combine into a cost: whenever a purge legitimately fails, this loop cannot distinguish that from a purge still running, so it spins the full ten seconds before the backstop takes over, on a suite whose whole point in this PR is CI time. Waiting on the thing the barrier actually means — the children having exited — would return immediately in both cases, and themaxRetriesrmwould still absorb the log-flush stragglers it is there for. Not worth blocking on: the failure is rare and the outcome is slow rather than wrong.