Tidy level package structure #178

Job	Run time
Discover regression systems	39s
Unit (windows-2025-vs2026, 3.13)	3m 36s
Unit (ubuntu-24.04, 3.14)	59s
Unit (ubuntu-24.04, 3.12)	50s
Unit (macos-26, 3.12)	1m 4s
Unit (ubuntu-24.04, 3.13)	46s
Unit (windows-2025-vs2026, 3.12)	1m 51s
Unit (macos-26, 3.13)	55s
Unit (macos-26, 3.14)	1m 12s
Unit (windows-2025-vs2026, 3.14)	1m 50s
Regression (fast) • methanol	1m 54s
Regression (fast) • octonol	4m 46s
Regression (fast) • cyclohexane	3m 27s
Regression (fast) • ethyl-acetate	2m 57s
Regression (fast) • methane	1m 49s
Regression (fast) • dna	1m 18s
Regression (fast) • benzaldehyde	3m 8s
Regression (fast) • water	1m 40s
Regression (fast) • benzene	2m 45s
Pre-commit	1m 12s
Docs	1m 5s
Coverage	1m 1s
	40m 44s

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