Some providers limit temp to less than 2

[scottyeager]

We should catch an error like this:

Error: failed to generate commit message: failed to get completion: 
POST "https://api.mistral.ai/v1/chat/completions": 
422 Unprocessable Entity {"object":"error","message":{"detail":[{"type":"less_than_equal","loc":
["body","temperature"],"msg":"Input should be less than or equal to 1.5","input":2,"ctx":
{"le":1.5},"url":"https://errors.pydantic.dev/2.10/v/less_than_equal"}]},
"type":"invalid_request_error","param":null,"code":null}

and print a helpful message.

[scottyeager]

It might also be good to add a config field that sets the max temp for a provider. Then we can adjust automatically before sending off requests. This could be preset for known providers.