Allow overriding the kernel version check for recv multishot

open file with O_DIRECT

kqueue backend: in-process waker does not interrupt kevent() poll

executor: aborts on multiple panics

RFC(driver,unix): replace libc with nix

Potential double free issue

perf(driver): `CancelRegistry` is slow

Need some special design for managed and multishot `recvmsg`

[Feature Request] Noq QUIC library integration

RFC: Refactor signal