Test

Fix multi-channel compositing and add per-channel norm support #1266

Job	Run time
get-environments	8s
hatch-test.py3.14-stable	3m 50s
hatch-test.py3.11-stable	3m 37s
hatch-test.py3.14-pre (PRE-RELEASE DEPENDENCIES)	3m 14s
Tests pass in all hatch environments	5s
	10m 54s

Provide feedback