Stabilize CI test runs with deterministic environment settings #73

Job	Run time
Discover regression systems	48s
Unit (macos-15, 3.12)	44s
Unit (windows-2025, 3.13)	1m 41s
Unit (ubuntu-24.04, 3.12)	56s
Unit (ubuntu-24.04, 3.13)	46s
Unit (macos-15, 3.13)	1m 13s
Unit (ubuntu-24.04, 3.14)	1m 6s
Unit (windows-2025, 3.12)	2m 36s
Unit (windows-2025, 3.14)	1m 46s
Unit (macos-15, 3.14)	1m 9s
Docs	1m 2s
Coverage	1m 6s
Regression (fast) • dna	2m 20s
Pre-commit	1m 12s
Regression (fast) • cyclohexane	4m 54s
Regression (fast) • methane	2m 30s
Regression (fast) • methanol	2m 28s
Regression (fast) • benzaldehyde	5m 8s
Regression (fast) • water	2m 30s
Regression (fast) • ethyl-acetate	4m 34s
Regression (fast) • benzene	4m 42s
Regression (fast) • octonol	7m 2s
	52m 13s

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