Use io_uring for socket readiness - #401
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Use a process-wide io_uring to multiplex socket readiness waits on supported Linux systems while preserving poll as the automatic fallback. Add auto, off, and required modes for same-binary production A/B tests, including fail-fast behavior when a canary cannot keep using io_uring. Production validation: compare --io-uring required with --io-uring off before merging.
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Use a process-wide io_uring to multiplex socket readiness waits on
supported Linux systems while preserving poll as the automatic fallback.
Add auto, off, and required modes for same-binary production A/B
tests, including fail-fast behavior when a canary cannot keep using
io_uring.
Production validation: compare --io-uring required with
--io-uring off before merging.