Studio's setup.sh provisioning runs install_llama_prebuilt.py, whose
host-probing cannot succeed inside an image build, so it fell back to a
CPU-only llama.cpp source build layered over the baked CUDA bundle.
setup.sh skips that fallback when build/bin/llama-server and
build/bin/llama-quantize are executable, so hardlink the installed bundle
into build/bin: zero extra bytes, $ORIGIN rpath still resolves, and no
symlink cycle when setup.sh later relinks the root quantizer to
build/bin/llama-quantize.
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