docs(codec): PR-X12 substrate canon resolutions — 18 open items resolved #458

Job	Run time
nostd/thumbv6m-none-eabi/stable	25s
format/stable	20s
native-backend/stable	8m 22s
Pass MSRV values to other jobs	3s
tier4-avx512-check	1m 35s
clippy/1.95.0	40s
hpc-stream-parallel/rayon	1m 16s
cross_test/${{ matrix.target }}/${{ matrix.rust }}	0s
miri	0s
nightly-simd-polyfill	0s
docs/nightly	0s
cargo-careful	0s
blas-msrv	54s
tests/beta	10m 54s
tests/1.95.0	10m 55s
tests/stable	11m 8s
conclusion	0s
	46m 32s

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