gate auto backend off metal GPUs without simdgroup matmul#72
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Pre-Apple7 devices (Intel iGPUs, AMD dGPUs on Intel Macs) have simdgroup reduction but not simdgroup matrix multiply, so ggml's supports_op accepts whisper-class matmuls and the vec fallback kernels silently produce garbage ("!!!!!") at ~0.01x realtime (Handy#1608). AUTO now skips such devices and falls back to CPU; explicit metal / gpu_device selections are honored with a warning. Apple Silicon (M-series, all Apple7+) unaffected.