docs(hpc/soa): P2 savant tightenings — f32-only scope + hpc::soa layering rationale + integration test ungate (orphan rescue from #156) #312

Job	Run time
clippy/1.95.0	40s
hpc-stream-parallel/rayon	1m 21s
Pass MSRV values to other jobs	3s
nostd/thumbv6m-none-eabi/stable	25s
format/stable	20s
native-backend/stable	7m 49s
cross_test/${{ matrix.target }}/${{ matrix.rust }}	0s
miri	0s
cargo-careful	0s
docs/nightly	0s
tests/stable	10m 33s
tests/1.95.0	12m 28s
blas-msrv	54s
tests/beta	10m 53s
conclusion	0s
	45m 26s

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