fix+test: cpu_tier_for_cpu cross-arch + Pillar 12/13/14 drift-checks #428

Job	Run time
nostd/thumbv6m-none-eabi/stable	27s
tier4-avx512-check	27s
format/stable	23s
Pass MSRV values to other jobs	4s
native-backend/stable	7m 45s
hpc-stream-parallel/rayon	1m 24s
clippy/1.95.0	39s
cross_test/${{ matrix.target }}/${{ matrix.rust }}	0s
cargo-careful	0s
docs/nightly	0s
miri	0s
nightly-simd-polyfill	-7s
blas-msrv	46s
tests/stable	10m 25s
tests/1.95.0	11m 14s
tests/beta	11m 3s
conclusion	0s
	44m 30s

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