Break recursive run/clean calls

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 75.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 89.07%. Comparing base (1a6f0af) to head (2c809a1). Report is 3 commits behind head on main.

Files	Patch %	Lines
foamlib/_cases/_base.py	75.00%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #144 +/- ## ========================================== + Coverage 89.05% 89.07% +0.02% ========================================== Files 12 12 Lines 813 815 +2 ========================================== + Hits 724 726 +2 Misses 89 89 ```

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