Stabilize CI test runs with deterministic environment settings #83

Job	Run time
Discover regression systems	53s
Unit (ubuntu-24.04, 3.12)	5m 12s
Unit (macos-15, 3.14)	1m 20s
Unit (windows-2025, 3.12)	2m 26s
Unit (macos-15, 3.13)	1m 10s
Unit (macos-15, 3.12)	52s
Unit (windows-2025, 3.13)	2m 24s
Unit (ubuntu-24.04, 3.14)	1m 2s
Unit (ubuntu-24.04, 3.13)	57s
Unit (windows-2025, 3.14)	1m 47s
Docs	1m 7s
Regression (fast) • ethyl-acetate	2m 30s
Regression (fast) • benzaldehyde	3m 12s
Pre-commit	1m 17s
Regression (fast) • water	1m 40s
Coverage	1m 11s
Regression (fast) • cyclohexane	3m 45s
Regression (fast) • octonol	5m 14s
Regression (fast) • methanol	1m 53s
Regression (fast) • dna	1m 38s
Regression (fast) • methane	1m 49s
Regression (fast) • benzene	2m 46s
	46m 5s

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