`test_extra_body_overrides_the_profile_slot` guards that a source's
`extra_body` wins over the slot the profile injects. Since T5 made
`enable_thinking=True` mean `auto`, its minimax fixture injected an empty
fragment — swapping the two update calls changed nothing and the whole
suite stayed green, while a real source (zhipu, glm-5.3, tier `low`)
would have shipped `low` instead of the `high` the caller wrote. Move the
fixture onto that combination, where the two sides write the same key.
`emit_attempt`'s docstring promises `reasoning_applies` carries no
default so that a missed argument is a TypeError rather than a silent
`True`; nothing enforced it. Pin the signature the way `record_llm_call`
is already pinned.
iomgaa
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