docs(codec): PR-X12 substrate canon resolutions — 18 open items resolved #456

Job	Run time
hpc-stream-parallel/rayon	1m 29s
format/stable	21s
nostd/thumbv6m-none-eabi/stable	28s
clippy/1.95.0	40s
native-backend/stable	6m 50s
Pass MSRV values to other jobs	2s
tier4-avx512-check	28s
cargo-careful	0s
docs/nightly	0s
nightly-simd-polyfill	0s
cross_test/${{ matrix.target }}/${{ matrix.rust }}	0s
miri	-1s
tests/beta	11m 34s
tests/stable	10m 40s
blas-msrv	1m 8s
tests/1.95.0	10m 48s
conclusion	0s
	44m 27s

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