* fix(llm): respect reasoning_effort setting on native OpenAI path
The native OpenAI provider path hardcoded reasoning effort to xhigh for
gpt-5.4/5.5/codex models, silently ignoring the user's reasoning_effort
config setting. The OpenRouter path already honors the
EVOSCIENTIST_REASONING_EFFORT env var that settings.py exports from that
setting; this applies the same lookup on the native path, falling back
to the previous defaults when unset.
Adds a regression test and isolates the existing xhigh test from the
env var.
* fix(llm): preserve model reasoning defaults
* fix(llm): preserve GPT-5.6 reasoning default
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Co-authored-by: Xi Zhang <106144707+X-iZhang@users.noreply.github.com>
Mani Saint-Victor
da6ca38d53