Extends hardware::CpuInfo with a CpuFeatures struct populated via
std::is_x86_feature_detected! on x86_64 and an architectural
assumption for aarch64 (NEON). Adds has_ggml_baseline() so callers
can cheaply ask 'will whisper.cpp / llama.cpp ship a fast path on
this CPU?' without knowing the arch-specific rule.
The point of #7 is giving the runtime a way to surface a clear
"non-AVX2 fallback" warning before the user hits a wall of silent
slowness. The banner itself ships in the next commit as part of
get_runtime_capabilities (item #1). Tests cover the baseline helper
on both x86 and non-x86 targets.
Co-authored-by: jars <jakejars@users.noreply.github.com>
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