Add behavioral load-balancing test for #663 - #754
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…#663) The unit tests pin the pressure term in the cost formula, but nothing ran tasks end to end and checked placement, which is how JuliaParallel#663 shipped unnoticed. Add a behavioral check: 40 sleeping tasks over 4 workers land [1 => 40] when the pressure term is dead and spread across workers when it is live. Verified failing on 59081dc (pre-JuliaParallel#744) and passing on master.
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Follow-up to #744/#745: the unit tests pin the pressure term in the cost formula, but nothing runs tasks end to end and checks placement, which is how #663 shipped unnoticed. This adds a behavioral check: 40 sleeping tasks over 4 workers, asserting they do not all land on worker 1.
Verified it fails on 59081dc (pre-#744, gets
[1 => 40]) and passes on master (gets10/10/10/10). Scheduler suite: 269 pass, 5 broken (pre-existing).