Test Slevomat Coding Standard

`CLAUDE.md`: fix filename and add to `.gitattributes` #481

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Run time

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Job	Run time
Tests (8.1)	40s
Tests (8.0)	39s
Tests (7.4)	21s
Tests (8.3)	18s
Tests (8.2)	37s
Tests (8.4)	19s
	2m 54s