docs(simd): dispatch architecture + parity matrix + tech debt + integration plan #369

Job	Run time
nostd/thumbv6m-none-eabi/stable	26s
Pass MSRV values to other jobs	2s
clippy/1.95.0	39s
native-backend/stable	6m 36s
format/stable	21s
hpc-stream-parallel/rayon	1m 29s
miri	0s
cross_test/${{ matrix.target }}/${{ matrix.rust }}	0s
cargo-careful	-1s
docs/nightly	-1s
tests/1.95.0	10m 48s
tests/beta	13m 1s
blas-msrv	54s
tests/stable	11m 10s
conclusion	0s
	45m 24s

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