refactor(simd): Phase 4 — extract scalar backend to src/simd_scalar.rs #381

Job	Run time
hpc-stream-parallel/rayon	1m 27s
clippy/1.95.0	43s
nostd/thumbv6m-none-eabi/stable	26s
native-backend/stable	7m 52s
Pass MSRV values to other jobs	2s
format/stable	22s
cargo-careful	0s
miri	0s
cross_test/${{ matrix.target }}/${{ matrix.rust }}	0s
docs/nightly	0s
tests/beta	10m 59s
tests/1.95.0	10m 39s
blas-msrv	1m 37s
tests/stable	10m 37s
conclusion	-1s
	44m 43s

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