AMX int8/bf16 tile GEMM — enable, fix 5 bugs, optimize (0→197 GMAC/s) + vertical-SIMD primitives #547

Job	Run time
clippy/1.95.0	40s
nostd/thumbv6m-none-eabi/stable	30s
format/stable	19s
hpc-stream-parallel/rayon	1m 27s
native-backend/stable	8m 25s
tier4-avx512-check	33s
Pass MSRV values to other jobs	4s
cargo-careful	-1s
nightly-simd-polyfill	-1s
miri	-1s
docs/nightly	-1s
cross_test/${{ matrix.target }}/${{ matrix.rust }}	-1s
blas-msrv	53s
tests/stable	10m 57s
tests/beta	11m 40s
tests/1.95.0	11m 14s
conclusion	0s
	46m 37s

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