fix: chunked BF16, buffer cap, drop fake FMA #73

Job	Run time
format/stable	24s
nostd/thumbv6m-none-eabi/stable	26s
Pass MSRV values to other jobs	3s
clippy/stable	24s
cross_test/i686-unknown-linux-gnu/stable	1m 34s
native-backend/stable	35s
cross_test/s390x-unknown-linux-gnu/stable	1m 35s
miri	-1s
docs/nightly	-1s
cargo-careful	-1s
blas-msrv	57s
tests/stable	1m 27s
tests/1.64.0	1m 15s
tests/beta	1m 30s
conclusion	0s
	10m 7s

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