Revert #160 — HPC stability docs + l1/l2/linf kernels (four-repo arc) #342

Job	Run time
clippy/1.95.0	40s
format/stable	20s
nostd/thumbv6m-none-eabi/stable	24s
native-backend/stable	7m 48s
hpc-stream-parallel/rayon	1m 23s
Pass MSRV values to other jobs	3s
docs/nightly	0s
cross_test/${{ matrix.target }}/${{ matrix.rust }}	0s
cargo-careful	0s
miri	0s
tests/1.95.0	11m 15s
tests/stable	11m 2s
tests/beta	11m 31s
blas-msrv	56s
conclusion	0s
	45m 22s

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