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resolveRequestedModel() only special-cased "auto" and the composer
"-fast" suffix; every pinned Claude/GPT id carrying an effort/reasoning
suffix (e.g. "claude-opus-4-8-high", "gpt-5.5-high") fell through and
was sent to cursor's server verbatim as model_id, with an empty
parameters array. Cursor has no route for the suffixed id -- it only
knows the base id plus an out-of-band ModelParameter -- so it accepted
the request but returned an empty turn.
Split the known effort suffixes (-low/-medium/-high/-xhigh/-max) off
the base id: Claude ids surface an {id:"effort", value} parameter,
GPT ids surface {id:"reasoning", value}, matching the real cursor-agent
client's wire format. encodeAgentRunRequest()'s ModelDetails fields
derive from the same resolved base id, so the #3714 pinned-model
ModelDetails envelope stays correct without further changes.
Updates the existing resolveRequestedModel test that locked in the
buggy verbatim pass-through, and the #3714 ModelDetails test to assert
against the base id. Adds a dedicated regression test file proving the
Claude/GPT split plus non-regression of the "-fast" toggle and
unsuffixed ids.