Task: Fix TCP Keep-Alive Detection on Write-Blocked Sockets

Task: Fix TCP Keep-Alive Detection on Write-Blocked Sockets: a task in Terminal-Lego-15k (Harbor dataset). When using TCP Keep-Alive with epoll on Linux, there is a known issue: if a socket's send buffer is full (i.e., send() returned EAGAIN ), the TCP keep-alive probes may not be sent, and epoll…