Prevent agent-zero from overriding sampling parameters - or provide more options

[sammcj]

At present Agent-Zero only has the basic 'temperature' sampling parameter and as it cannot be disabled - may mess up the more advanced sampling options configured in the model.

For context - temperature is a very basic sampling option which essentially injects noise (randomness) into part of the prediction algorithm and is very rudimentary and can be problematic for code generation (should pretty much always be set to 0 unless you're using min_p). Initially top_p replaced temperature as the most effective simple way of controlling "creativity" aka randomness, then min_p came out which is a good upgrade from top_p. In other words - we're two evolutions past setting 'temperature' alone.

It would be great if Agent Zero additionally let you set:

• min_p
• top_p
• repetition penalty

and let you unset temperature (as in - don't send it with API requests to Ollama).

Further reading on why min_p is important huggingface/transformers#27670

Example of a sensible default configuration for a coding model (Qwen 2.5 Coder 32b in this case) that you don't want to be too ridged but want to retain high quality tokens:

### min_p sampling ##

# 1.0 disables top_p, so we can use min_p
PARAMETER top_p 1.0

# min_p works best with a small amount of temperature
PARAMETER temperature 0.2
PARAMETER min_p 0.9

PARAMETER repeat_penalty 1.05