Run Coveralls coverage on pull requests and main branch updates #140

Job	Run time
Pre-commit	1m 13s
Coverage	57s
Discover regression systems	46s
Unit (macos-15, 3.14)	53s
Unit (macos-15, 3.13)	53s
Unit (macos-15, 3.12)	1m 12s
Unit (windows-2025, 3.13)	1m 43s
Unit (ubuntu-24.04, 3.13)	44s
Unit (windows-2025, 3.12)	2m 6s
Unit (ubuntu-24.04, 3.14)	54s
Unit (windows-2025, 3.14)	3m 9s
Unit (ubuntu-24.04, 3.12)	48s
Regression (fast) • ethyl-acetate	3m 16s
Regression (fast) • dna	1m 24s
Regression (fast) • cyclohexane	4m 19s
Regression (fast) • benzaldehyde	3m 19s
Regression (fast) • methane	2m 4s
Docs	1m 6s
Regression (fast) • benzene	3m 18s
Regression (fast) • octonol	5m 28s
Regression (fast) • methanol	2m 11s
Regression (fast) • water	2m 11s
	43m 54s

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