Lint

Extract shared helpers and fix strict-kwargs call sites #1258

Job	Run time
build (3.13, ubuntu-latest, pre-push)	36s
build (3.13, windows-latest, pre-commit)	29s
build (3.13, windows-latest, manual)	37s
build (3.13, windows-latest, pre-push)	15s
build (3.13, ubuntu-latest, pre-commit)	23s
build (3.13, ubuntu-latest, manual)	21s
completion-lint	3s
	2m 44s

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