docs(codec): PR-X12 substrate merged-canon — session A + B synthesis #450

Job	Run time
nostd/thumbv6m-none-eabi/stable	27s
hpc-stream-parallel/rayon	1m 30s
Pass MSRV values to other jobs	2s
clippy/1.95.0	39s
tier4-avx512-check	33s
format/stable	20s
native-backend/stable	6m 43s
cross_test/${{ matrix.target }}/${{ matrix.rust }}	0s
docs/nightly	0s
miri	0s
cargo-careful	0s
nightly-simd-polyfill	0s
blas-msrv	53s
tests/stable	10m 57s
tests/1.95.0	10m 46s
tests/beta	9m 37s
conclusion	0s
	42m 27s

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