The A/B harness used to measure the idle-sleep work that shipped in
main (#2559): Measure-EventLoop.ps1 and measure-event-loop.sh drive
CPU/lag comparisons across server.eventLoopIdleWaitMs settings, and
HostLatencyProbe.cs measures what basic operations cost on a host.
dev-docs/measuring-event-loop.md explains the method, the numbers that
matter, and how to re-vendor IORingGroup for ring experiments.
This branch is main plus this commit, rebased forward as main moves.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
