When the host sleeps while a model response is streaming, the connection
dies on wake with 'Stream read error: error decoding response body' and
the turn was lost. The engine now stamps every stream chunk with both
monotonic and wall-clock time; Instant pauses across a suspend while
SystemTime does not, so a >10s divergence on a stream error identifies a
sleep/wake cycle. In that case the partial output is discarded and the
identical request is re-issued (sharing the existing MAX_STREAM_RETRIES=3
budget) instead of failing the turn. Ordinary network flakes keep the
deliberate no-retry-after-content policy from #103.
Hunter B
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