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34e8511294
The streaming-fix commit (49e5581b5) replaced the post-loop
`_extract_finish_reason_and_response_id(last_chunk)` call with the
incrementally-tracked `stream_finish_reason` / `stream_response_id`,
which removed the only reader of `last_chunk` in
`_ahandle_streaming_response`. The declaration and per-iteration
assignment were left behind — harmless but confusing for future
readers because the sync sibling still legitimately uses `last_chunk`
(for usage and content fallbacks via `_handle_streaming_callbacks`).
The async path inlines its usage extraction directly inside the loop
(`chunk.model_extra.get("usage")`), so there's no fallback consumer.
Drop both lines.
Sync path untouched — `last_chunk` there is still load-bearing.