Adds _setup_rocm() to tools.func, called from _setup_amd_gpu() and
_setup_amd_apu(). Installs the full ROCm stack from repo.radeon.com:
- GPG key + deb822 repo with pin-priority 600
- Full 'rocm' meta-package (fallback: rocm-opencl-runtime + rocm-smi-lib)
- /etc/profile.d/rocm.sh for PATH/LD_LIBRARY_PATH
- ldconfig for /opt/rocm/lib
- Supports Debian 12/13 and Ubuntu 22.04/24.04 (amd64 only)
- Graceful skip on unsupported OS/arch
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