test(dlx/arborist): cover pure helpers + writeSafeNpmrc (20 added, 74… #2099

Job	Run time
Run CI Pipeline / 🔎 Check	30s
Run CI Pipeline / 🧪 Test Matrix (26.1.0, macos-latest)	40s
Run CI Pipeline / 🧪 Test Matrix (26.1.0, windows-latest)	1m 18s
Run CI Pipeline / 🧪 Test Matrix (26.1.0, ubuntu-latest)	27s
Run CI Pipeline / 🏷️ Type Check	0s
Run CI Pipeline / 🧹 Lint	0s
Test (Isolated)	-1s
	2m 54s

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