issue: Cerebras models are not being recognized despite being actively displayed as the active model.
reproduce:
1. use a (free) OR premium Cerebras API key and connect it using /model:pack in mastraco
de (Setup)
2. models are correctly displayed but fail on sending a message with:
" Error: Model not found. Please select a different model with /models.
Hint: Use /models to select a different model"