PR-X3: BlockedGrid hierarchical block layout (workers A1-A5 + design docs) #320

Job	Run time
format/stable	20s
clippy/1.95.0	41s
native-backend/stable	7m 50s
hpc-stream-parallel/rayon	1m 27s
Pass MSRV values to other jobs	4s
nostd/thumbv6m-none-eabi/stable	32s
cargo-careful	0s
miri	0s
docs/nightly	-1s
cross_test/${{ matrix.target }}/${{ matrix.rust }}	-1s
tests/beta	10m 37s
tests/1.95.0	9m 26s
blas-msrv	59s
tests/stable	10m 29s
conclusion	-1s
	42m 22s

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