Some OpenAI-compatible gateways default to SSE streaming when `stream` is omitted,
but graphify always reads the result as a single resp.choices[0]. The call would
then fail against those gateways. Pass `stream: False` explicitly.
Ported from PR #1482 by @jiangyq9 (covers the extraction dispatch path,
_call_openai_compat). Maintainer fix on top: applied the same `stream: False` to
the second OpenAI-compatible call site, _call_llm, which feeds the --dedup-llm
tiebreaker and had the identical bug.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>