docs(codec): PR-X12 substrate merged-canon — session A + B synthesis #451

Job	Run time
clippy/1.95.0	39s
Pass MSRV values to other jobs	2s
native-backend/stable	7m 54s
format/stable	22s
tier4-avx512-check	27s
hpc-stream-parallel/rayon	1m 26s
nostd/thumbv6m-none-eabi/stable	27s
miri	-1s
cargo-careful	-1s
nightly-simd-polyfill	-1s
docs/nightly	-1s
cross_test/${{ matrix.target }}/${{ matrix.rust }}	-1s
tests/beta	10m 52s
tests/stable	11m 13s
blas-msrv	59s
tests/1.95.0	11m 15s
conclusion	0s
	45m 31s

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