* quiet llama.cpp build, smarter CUDA install via winget, accept Python 3.11-3.13
* studio: hide Python traceback when setup script exits with error
* setup.ps1: auto-add Python Scripts dir to PATH so 'unsloth' command works in new terminals
* setup.ps1: fix GPU check to run nvidia-smi instead of just checking command existence
* setup.ps1: fix PATH check to use exact entry comparison instead of substring match
* setup.ps1: validate Python probe exit code before persisting Scripts PATH
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