docs(codec): PR-X12 substrate canon resolutions — 18 open items resolved #459

Job	Run time
Pass MSRV values to other jobs	3s
hpc-stream-parallel/rayon	1m 25s
nostd/thumbv6m-none-eabi/stable	27s
format/stable	22s
native-backend/stable	8m 20s
clippy/1.95.0	40s
tier4-avx512-check	29s
cargo-careful	0s
nightly-simd-polyfill	0s
miri	0s
cross_test/${{ matrix.target }}/${{ matrix.rust }}	0s
docs/nightly	-1s
tests/beta	11m 22s
tests/stable	11m 15s
blas-msrv	46s
tests/1.95.0	10m 47s
conclusion	0s
	45m 55s

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