feat: MoE gate topology + expert clustering + scaffold cross-referenc… #81

Job	Run time
miri	27s
cross_test/s390x-unknown-linux-gnu/stable	1m 35s
native-backend/stable	34s
clippy/stable	22s
docs/nightly	41s
cargo-careful	40s
format/stable	22s
Pass MSRV values to other jobs	3s
nostd/thumbv6m-none-eabi/stable	24s
cross_test/i686-unknown-linux-gnu/stable	1m 33s
blas-msrv	54s
tests/beta	1m 25s
tests/1.64.0	1m 19s
tests/stable	1m 29s
conclusion	0s
	11m 48s

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