Push 2 went red on a SIXTH member of the load-sensitive family
(PrunedId_RejectAtFreshSequence_ReclaimKeepsTheStreamAligned), with the
assembly taking 59 s on Linux against ~7 s on Windows. Laning members one at a
time was the pattern that already failed to converge, so this addresses the
assembly instead.
The split is measured, not defensive: on this 6-core container Core.Net FAILS
in 40 s with default parallelism and PASSES in 10 s single-threaded. Its
sessions do real socket work on background threads, so contention both breaks
and slows them. Windows keeps default parallelism — 18 cores, ~7 s, and it
REGRESSED when the same assembly was serialized there.
An earlier attempt passed the flag through a bash array inside the shared loop
and never reached dotnet. This gives the project its own explicit invocation so
the flag cannot be swallowed.
3dd1af5ec1