W1a vertical SIMD primitives + W2/W3/W4 polish (compile-time dispatch) #510

Job	Run time
Pass MSRV values to other jobs	4s
native-backend/stable	7m 34s
clippy/1.95.0	38s
hpc-stream-parallel/rayon	1m 9s
format/stable	21s
tier4-avx512-check	29s
nostd/thumbv6m-none-eabi/stable	29s
nightly-simd-polyfill	0s
miri	0s
cargo-careful	0s
docs/nightly	0s
cross_test/${{ matrix.target }}/${{ matrix.rust }}	0s
blas-msrv	49s
tests/1.95.0	10m 38s
tests/stable	11m 17s
tests/beta	10m 22s
conclusion	0s
	43m 50s

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