Test

Fix multi-channel compositing and add per-channel norm support #1267

Job	Run time
get-environments	7s
hatch-test.py3.11-stable	3m 2s
hatch-test.py3.14-pre (PRE-RELEASE DEPENDENCIES)	3m 4s
hatch-test.py3.14-stable	3m 2s
Tests pass in all hatch environments	4s
	9m 19s

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