W1a vertical SIMD primitives + W2/W3/W4 polish (compile-time dispatch) #511

Job	Run time
format/stable	21s
nostd/thumbv6m-none-eabi/stable	29s
tier4-avx512-check	28s
Pass MSRV values to other jobs	2s
clippy/1.95.0	39s
hpc-stream-parallel/rayon	1m 3s
native-backend/stable	8m 20s
docs/nightly	0s
cross_test/${{ matrix.target }}/${{ matrix.rust }}	0s
nightly-simd-polyfill	0s
cargo-careful	0s
miri	0s
blas-msrv	55s
tests/stable	11m 17s
tests/1.95.0	10m 39s
tests/beta	10m 53s
conclusion	0s
	45m 6s

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