Lint

Use assert_never for enum fallbacks (#3177) #7886

Job	Run time
build (3.14, ubuntu-latest, manual)	55s
build (3.14, ubuntu-latest, pre-commit)	1m 0s
build (3.14, ubuntu-latest, pre-push)	6m 13s
build (3.14, windows-latest, pre-push)	9m 4s
build (3.14, windows-latest, pre-commit)	2m 3s
build (3.14, windows-latest, manual)	2m 4s
completion-lint	2s
	21m 21s

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