Test

feat: return a useful value from `CodecPipeline.read()` #6584

Job	Run time
py=3.11-min_deps	1m 57s
doctests	1m 0s
py=3.13-upstream	1m 57s
os=ubuntu-latest, py=3.11, deps=minimal	1m 57s
os=ubuntu-latest, py=3.12, deps=optional	1m 57s
os=ubuntu-latest, py=3.11, deps=optional	1m 57s
os=ubuntu-latest, py=3.13, deps=optional	1m 57s
os=macos-latest, py=3.13, deps=optional	2m 0s
os=windows-latest, py=3.11, deps=optional	1m 50s
os=windows-latest, py=3.13, deps=optional	1m 51s
os=macos-latest, py=3.11, deps=optional	2m 1s
os=ubuntu-latest, py=3.12, deps=minimal	1m 59s
os=ubuntu-latest, py=3.13, deps=minimal	1m 58s
Test complete	3s
	24m 24s

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