AMX int8/bf16 tile GEMM — enable, fix 5 bugs, optimize (0→197 GMAC/s) + vertical-SIMD primitives #549

Job	Run time
hpc-stream-parallel/rayon	1m 31s
clippy/1.95.0	50s
format/stable	21s
nostd/thumbv6m-none-eabi/stable	26s
Pass MSRV values to other jobs	2s
tier4-avx512-check	36s
native-backend/stable	8m 29s
docs/nightly	0s
miri	0s
cross_test/${{ matrix.target }}/${{ matrix.rust }}	0s
cargo-careful	0s
nightly-simd-polyfill	0s
blas-msrv	57s
tests/1.95.0	10m 50s
tests/stable	11m 23s
tests/beta	11m 50s
conclusion	0s
	47m 15s

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