CommandCode fronts DeepSeek with vendor-prefixed ids
(deepseek/deepseek-v4-flash). DeepSeek V4+ defaults to thinking mode
when the thinking field is omitted, so /reasoning none changed the
Hermes session state but not the actual request -- the turn sat in
reflecting.../brainstorming... for minutes (#95232). Strip the vendor
prefix for DeepSeek-family ids and delegate to the native DeepSeek
profile's build_api_kwargs_extras (extra_body.thinking +
reasoning_effort mapping); other CommandCode model families keep the
base no-op behavior. The prior no-op tests codified the bug and are
rewritten to pin the new contract.
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