Register each file descriptor once with epoll / kqueue#314
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Persistently register each descriptor with epoll/kqueue and reuse it across reads and writes, detaching only on EOF, error, cancellation, or close: - Switch epoll/kqueue to edge-triggered (EPOLLET / EV_CLEAR). - Make read()/write() attempt the non-blocking syscall first and await a readiness signal only on EAGAIN. - Detach in _safelyClose on Unix, mirroring Windows.
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Persistently register each descriptor with epoll/kqueue and reuse it across reads and writes, detaching only on EOF, error, cancellation, or close: