Function generate 

pub async fn generate(
    patch: String,
    remaining_tokens: usize,
    model: Model,
    settings: Option<&AppConfig>,
) -> Result<Response>

Generates a commit message using the AI model. Now uses the multi-step approach by default with fallback to single-step.

Arguments

• diff - The git diff to generate a commit message for
• max_tokens - Maximum number of tokens allowed for the response
• model - The AI model to use for generation
• settings - Optional application settings to customize the request

Returns

• Result<openai::Response> - The generated commit message or an error

Errors

Returns an error if:

• max_tokens is 0
• OpenAI API call fails