Serializing AcDream.Core.Net.Tests to fix a Linux starvation REGRESSED Windows,
which had been green: Core.Net went from 1000 passed in 7 s (run 154) to
999/1000 in 17 s (run 155), taking down LossSoak_TwoPercentBidirectional_
ZeroMessageLoss_LedgersConverge, a test that had never failed. That trade trans-
ferred the flake between platforms rather than fixing anything, so it is
reverted: no xunit.runner.json, no csproj change.
The actual fragility is narrower than it looked — exactly ONE test uses
real-time waits (PausedSelector_SeededDroppedServerReady_RecoversOnIdleSweep),
and its harness drives a VIRTUAL clock while asserting on 2 s wall-clock
windows. Those windows are patience for background work, not part of the
assertion, and 2 s only ever encoded 'the machine is idle'. They now share a
60 s HarnessPatience constant.
Nothing about what the test verifies changes: recovery must still occur, a
genuine failure to NAK still fails, and a real hang is still bounded. Campaign N
transport code is untouched.
Local: 1000/1000 in 6 s under the gate filter.
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