Test

Fix multi-channel compositing and add per-channel norm support #1270

Job	Run time
get-environments	11s
hatch-test.py3.14-pre (PRE-RELEASE DEPENDENCIES)	3m 9s
hatch-test.py3.14-stable	5m 4s
hatch-test.py3.11-stable	3m 39s
Tests pass in all hatch environments	5s
	12m 8s

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