Test

poc: ChunkLayout for chunk and shard inspection #7670

Job	Run time
Benchmark smoke test	7m 56s
py=3.14-upstream	7m 58s
doctests	1m 3s
os=ubuntu-latest, py=3.12, deps=optional	8m 32s
py=3.12-min_deps	7m 26s
os=ubuntu-latest, py=3.14, deps=minimal	4m 16s
os=macos-latest, py=3.14, deps=optional	4m 8s
os=ubuntu-latest, py=3.13, deps=minimal	6m 44s
os=ubuntu-latest, py=3.14, deps=optional	4m 13s
os=windows-latest, py=3.12, deps=optional	10m 53s
os=windows-latest, py=3.14, deps=optional	7m 52s
os=macos-latest, py=3.12, deps=optional	5m 18s
os=ubuntu-latest, py=3.12, deps=minimal	6m 39s
os=ubuntu-latest, py=3.13, deps=optional	8m 11s
Test complete	3s
	1h 31m 12s

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