run_serve_mux (continuous-batching serve, SERVE_BATCH=1) used select() on
STDIN_FILENO to poll for incoming requests. On native Windows/MinGW,
select() on a non-socket handle routes to winsock and always returns
SOCKET_ERROR (-1), so the batch serve loop compiled and printed READY but
could never accept a request.
Replaced the platform-specific polling with a dual implementation:
- POSIX (Apple/Linux): select() as before
- Windows: WaitForSingleObject on the stdin OS handle (works on both pipe
and console handles), with PeekNamedPipe to confirm bytes are available
The rest of the serve loop is now shared across platforms — no more Windows
stub. The function is no longer guarded behind #if __APPLE__/__linux__.
Co-authored-by: woolcoxm <13604288+woolcoxm@users.noreply.github.com>
woolcoxm
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