The `windows` runner session can't enumerate sockets: Get-NetTCPConnection and netstat come back empty even for the DevTools port the script is connected to, so "local server listening" failed on every run (main too, run 3145) and masked real regressions. When the socket list is empty, test what cinny #43 is about directly: the server must accept a connection on 127.0.0.1:44548 and refuse it on every non-loopback IPv4 address of the machine. The list-based check is kept for runners where it works. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01PPmy3tPq869XDW4njjVaKA