Rebase Scout shards to BF16-direct + F64x8 SIMD pipeline #69

Job	Run time
native-backend/stable	35s
cross_test/i686-unknown-linux-gnu/stable	1m 37s
clippy/stable	24s
Pass MSRV values to other jobs	2s
cross_test/s390x-unknown-linux-gnu/stable	1m 36s
nostd/thumbv6m-none-eabi/stable	27s
format/stable	24s
miri	0s
docs/nightly	0s
cargo-careful	0s
blas-msrv	1m 5s
tests/1.64.0	1m 31s
tests/stable	1m 33s
tests/beta	1m 31s
conclusion	0s
	10m 45s

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