When the endpoint forces upstream_stream_policy=force_non_stream while
the client streams, the local stream candidate watchdog still preferred
timeouts.first_byte_ms — a non-stream upstream produces no early first
byte, so the watchdog fired before the HTTP request_timeout and aborted
otherwise-healthy attempts at ~300s.
Read upstream_is_stream from report_context and invert the priority:
non-stream upstreams use total_ms first, falling back to first_byte_ms
and then the default; streaming upstreams keep the previous order.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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