fix(ci): phpcbf auto-format + add missing bootstrap requires for tests

212 PHPCS formatting errors auto-fixed by phpcbf across 18 files.
All remaining issues are warnings (exit 2), not errors — CI treats
exit 2 as success via the same pattern as peptide-news-plugin.

Also adds class-psa-ai-content.php and class-psa-directory-api.php to
tests/bootstrap.php require list — both files exist in includes/ but
were missing from bootstrap, causing 5 PHPUnit "Class not found"
failures in AIGeneratorTest and DirectoryTest.

includes/class-psa-encryption.php

@@ -79,7 +79,7 @@ class PSA_Encryption {
 		}
 
 		// First 16 bytes are the IV.
-		$iv = substr( $data, 0, 16 );
+		$iv             = substr( $data, 0, 16 );
 		$encrypted_data = substr( $data, 16 );
 
 		// Decrypt.