Tests

Multi-threaded reductions #2611

Job	Run time
Build and test on macos-latest (python 3.12)	9m 50s
Build and test on windows-latest (python 3.12)	12m 25s
Build and test on ubuntu-latest (python 3.12)	12m 41s
Build and test on ubuntu-latest (numpy 1.26)	12m 41s
Build and test on ubuntu-latest (python 3.14)	12m 40s
	1h 0m 17s

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