fix(anthropic): resolve parameter conflict with claude-opus-4-1-20250805

[jordibeen]

This fixes addresses a compatibility issue with Claude's latest model release, claude-opus-4-1-20250805.

This model version does not allow for sending along both the temperature and top_p parameter, it doesn't accept both simultaneously. Previously, the dispatcher was constructing the payload with both, leading to potential errors or unexpected behavior when interacting with Claude.

This change ensures that the payload only includes temperature and top_p if the corresponding model arguments are provided. This gives users the option to use Sonnet with both parameters, and leaving top_p empty for Opus.

Example configuration

Sonnet agent

{
    disable = false,
    name = "claude-sonnet",
    provider = "anthropic",
    chat = true,
    command = true,
    model = {
        model = "claude-sonnet-4-20250514",
        temperature = 0.8,
        top_p = 1
    },
    system_prompt = prompts["default"],
}

Opus agent

{
    disable = false,
    name = "claude-opus",
    provider = "anthropic",
    chat = true,
    command = true,
    model = {
        model = "claude-opus-4-1-20250805",
        temperature = 1
    },
    system_prompt = prompts["default"],
}