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Update CLAUDE.md with accurate repo structure and setup instructions #790

Job	Run time
Coding Standard	18s
Lint (8.1)	11s
PHPStan (8.0)	18s
PHPStan (8.1)	17s
Lint (8.0)	12s
Lint (8.2)	15s
Lint (8.4)	12s
Lint (7.4)	13s
PHPStan (8.3)	20s
Lint (8.3)	12s
PHPStan (8.4)	16s
PHPStan (7.4)	18s
PHPStan (8.2)	19s
Tests (ubuntu-latest, 8.4, lowest)	20s
Tests (ubuntu-latest, 7.4, lowest)	18s
Tests (windows-latest, 8.1, highest)	41s
Tests (windows-latest, 8.2, lowest)	38s
Tests (ubuntu-latest, 8.0, lowest)	16s
Tests (windows-latest, 7.4, lowest)	40s
Tests (ubuntu-latest, 8.2, lowest)	20s
Tests (windows-latest, 8.1, lowest)	41s
Tests (ubuntu-latest, 8.4, highest)	16s
Tests (ubuntu-latest, 8.2, highest)	17s
Tests (windows-latest, 8.0, highest)	44s
Tests (windows-latest, 8.3, highest)	38s
Tests (windows-latest, 8.4, lowest)	36s
Tests (windows-latest, 8.2, highest)	35s
Tests (ubuntu-latest, 8.1, lowest)	16s
Tests (windows-latest, 7.4, highest)	35s
Tests (ubuntu-latest, 8.3, lowest)	18s
Tests (ubuntu-latest, 8.3, highest)	18s
Tests (windows-latest, 8.0, lowest)	38s
Tests (ubuntu-latest, 8.1, highest)	17s
Tests (windows-latest, 8.4, highest)	44s
Tests (ubuntu-latest, 7.4, highest)	18s
Tests (windows-latest, 8.3, lowest)	38s
Tests (ubuntu-latest, 8.0, highest)	15s
	14m 38s

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