refactor(simd): Phase 4 — extract scalar backend to src/simd_scalar.rs #378

Job	Run time
native-backend/stable	7m 41s
format/stable	21s
Pass MSRV values to other jobs	3s
nostd/thumbv6m-none-eabi/stable	26s
hpc-stream-parallel/rayon	1m 24s
clippy/1.95.0	35s
miri	0s
docs/nightly	0s
cross_test/${{ matrix.target }}/${{ matrix.rust }}	0s
cargo-careful	0s
tests/1.95.0	10m 45s
tests/beta	10m 32s
blas-msrv	55s
tests/stable	11m 44s
conclusion	0s
	44m 26s

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