Change Light Atom Selection Criteria From Name To Mass #158

Job	Run time
MDAnalysis Compatibility Tests	0s
pre-commit	1m 6s
docs	45s
Run tests (windows-2025, 3.11)	1m 12s
Run tests (ubuntu-24.04, 3.13)	1m 8s
Run tests (ubuntu-24.04, 3.11)	1m 3s
Run tests (windows-2025, 3.13)	1m 13s
Run tests (windows-2025, 3.12)	1m 13s
Run tests (macos-15, 3.11)	55s
Run tests (ubuntu-24.04, 3.12)	1m 19s
Run tests (macos-15, 3.12)	1m 24s
Run tests (macos-15, 3.13)	1m 14s
	12m 32s

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