Brings AMD cards to parity with NVIDIA for monitoring/control surface, which was
NVML-only. New src/amd_smi.rs is a gpu_tune::GpuTuner backed by Linux amdgpu
sysfs (power1_average, temp1_input edge, freq1_input sclk, pp_dpm_sclk/mclk),
matched to the device by PCI bus id from OpenCL cl_khr_pci_bus_info. gpu_tune is
un-gated to compile under the gpu feature; open() probes NVML then amd_smi.
GpuSolver carries the tuner and Backend::Gpu dispatches power/temp/clocks, so the
TUI and --benchmark now show power, temperature, clocks and Sol/W for AMD.
Telemetry-only — setters are Unsupported (amdgpu control nodes are root-only).
--target-temp <C> adds an opt-in software governor (miner::govern_cadence) that
paces solve cadence to hold edge temperature, no hardware writes/root. With small
thermal throttle it won't beat flat-out on raw Sol/s; it's a temp/efficiency
lever. Unit-tested controller; flag/plumbing verified live.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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