Mistral API does not support the 'user' parameter that is part of OpenAI's standard API. This fix adds 'user' to the exclude list in _convert_completion_params() to prevent TypeError.

Description

Fixes a TypeError in the Mistral provider when the user parameter is included in completion requests.

Root cause:
The Mistral API does not support the OpenAI-standard user parameter, but MistralProvider._convert_completion_params() was not excluding it when converting CompletionParams to Mistral API format.

Changes:

• Added "user" to the exclude list in src/any_llm/providers/mistral/mistral.py (line 61)
• Updated comment to reflect that both reasoning_effort and user parameters are not supported

Code change:

# Before
converted_params = params.model_dump(
    exclude_none=True, exclude={"model_id", "messages", "response_format", "stream"}
)

# After
converted_params = params.model_dump(
    exclude_none=True, exclude={"model_id", "messages", "response_format", "stream", "user"}
)

PR Type

🐛 Bug Fix

Relevant issues

Fixes #679

Checklist

• I have added unit tests that prove my fix/feature works
• New and existing tests pass locally
• Documentation was updated where necessary
• I have read and followed the contribution guidelines