Live incident: the compatible-mode provider stalled mid-stream after
200 OK (~17s without data) and raised httpx.ReadTimeout, which was not
in the retriable exception-name set, so the call failed after 1
attempt and killed the whole run. Add ReadTimeout/ConnectTimeout/
WriteTimeout/PoolTimeout/TimeoutError/ConnectError to the transient
set in LLMErrorHandlingMiddleware (retry with backoff, then a
transient fallback message instead of generic), and add ReadTimeout/
ConnectTimeout to ai_writing's classify_exception for model
switching.
gozeros