1BRC-on-substrate probe + BF16 tile-GEMM tier ladder (VDPBF16PS, PackedBf16B, LE contract) + AMX Gotcha 14 #586

Job	Run time
nostd/thumbv6m-none-eabi/stable	35s
hpc-stream-parallel/rayon	1m 27s
format/stable	23s
clippy/1.95.0	50s
native-backend/stable	9m 5s
Pass MSRV values to other jobs	4s
tier4-avx512-check	54s
cross_test/${{ matrix.target }}/${{ matrix.rust }}	0s
cargo-careful	0s
docs/nightly	-1s
nightly-simd-polyfill	-1s
blas-msrv	1m 4s
tests/beta	12m 15s
tests/1.95.0	11m 59s
tests/stable	11m 54s
miri	-8s
conclusion	0s
	50m 20s

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