- Increase StreamIdleTimeout from 90s to 300s and MaxKeepaliveCount from 10 to 40
to prevent premature stream termination with DeepSeek V4 Pro (~50K token contexts)
- Add r.Context().Err() check after ConsumeSSE in empty_retry_runtime (chat + responses)
to prevent historySession.error() from overwriting historySession.stopped()
when the request context is cancelled
References:
- MaxKeepaliveCount=10 creates a 50s no-content timeout that kills the stream
before DeepSeek V4 Pro can produce its first token with large contexts
- Hermes Agent reports 'No response from provider for 180s' because the
underlying SSE connection was already terminated by ds2api at 50s
- Context cancellation path: OnContextDone -> stopped(), then finalize()
with empty output -> retry -> error() overwrites stopped()
