Revert #256 — the sealed-channel primitives went in on the wrong crates #688

Job	Run time
nostd/thumbv6m-none-eabi/stable	32s
wasm-simd/parity-node	54s
Pass MSRV values to other jobs	4s
neon-simd/parity-qemu	1m 5s
format/stable	22s
hpc-stream-parallel/rayon	1m 32s
native-backend/stable	7m 58s
clippy/1.95.0	44s
tier4-avx512-check	29s
nightly-simd-polyfill	-1s
cross_test/${{ matrix.target }}/${{ matrix.rust }}	-1s
miri	-1s
docs/nightly	-1s
cargo-careful	-1s
blas-msrv	51s
tests/1.95.0	10m 58s
tests/beta	11m 15s
tests/stable	11m 27s
conclusion	-1s
	48m 5s

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