this holds a connection open while whisper works, and nothing flows on it
meanwhile — exactly what an idle timeout kills. unset, Bun drops the
platform's connection at around 255s.
it was the last of three hops still doing it. the proxy's outbound fetch
and the platform's inbound timeout were both fixed earlier today and a
42-minute recording still died at 4m16s. whisperx went on and finished it;
the result was discarded.
with diarization on, align runs at roughly 1.5x the audio duration, so an
hour-long episode needs ninety minutes. no ceiling is both safe and high
enough, and 255 is Bun's maximum anyway — "raise it" was never available.
0 disables it.