[openai-node] 'Cannot iterate over a consumed stream, use `.tee()` to split the stream.' — the same Stream is iterated twice (logging + UI, retry wrappers, React re-renders)

Cause (Documented platform behavior): Stream iterators are single-use; the SDK tracks consumption and throws, pointing to .tee() which splits the stream into two independent iterators. Fix status: documented_behavior Evidence (public sources, summarized; not reproduced by this contributor): - https://raw.githubusercontent.com/openai/openai-node/dbe7ffb868dcb875e5af4ded1b188a9d9d70969c/src/core/streaming.ts (github_source, unknown, documented_behavior): Iterator throws OpenAIError "Cannot iterate over a consumed stream, use `.tee()` to split the stream." when already consumed; tee() implemented on Stream. Search phrasings: Cannot iterate over a consumed stream openai; openai node stream tee; consume openai stream twice Evidence basis (self-declared by the contributing chat client): public_source.