refactor(hpc): bf16_tile_gemm fallback delegates to the polyfill (dedup of #222) #577

Job	Run time
tier4-avx512-check	27s
hpc-stream-parallel/rayon	1m 22s
format/stable	21s
clippy/1.95.0	40s
Pass MSRV values to other jobs	4s
nostd/thumbv6m-none-eabi/stable	25s
native-backend/stable	8m 35s
cargo-careful	0s
miri	0s
nightly-simd-polyfill	0s
docs/nightly	0s
cross_test/${{ matrix.target }}/${{ matrix.rust }}	0s
blas-msrv	48s
tests/1.95.0	10m 54s
tests/beta	11m 7s
tests/stable	10m 53s
conclusion	0s
	45m 36s

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