Detection already works (get_best_device + HSA_OVERRIDE_GFX_VERSION); the
gap was that the default install ships CUDA torch, so AMD users fell back
to CPU with no guidance. Document the opt-in ROCm wheel swap (rocm6.2),
the device-verify one-liner, and the HSA override for unsupported GFX.
Linux-only, opt-in — default cross-platform behavior unchanged. An
installer-integrated env-var-driven wheel selection is a tracked follow-up.
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
