document temperature and system prompt sensitivity

[prabhu]

• cdx1 is very sensitive to temperature and the system prompt. This makes sense since the unsloth fine-tune has switched the architecture of phi-4 to llama and is therefore consistent with observations like these. Our approach to using unsloth/phi-4 is further validated by the fact, microsoft has now updated phi-4 configs using the unsloth patches.
• speculative decoding is supported with mlx!