style(cs-rules): remove mandatory blank line between class properties

PSR-12 does not require blank lines between properties. The previous rule
  'class_attributes_separation' => ['property' => 'one']
forced blank lines between every property, which is visually noisy in
classes with many related fields.

Changed to 'property' => 'none' — only method separation remains enforced.
Automatically removed the blank lines from ProjectContextTest.php via cs:fix.

Author: walmir-silva

src/Core/ProjectDetector.php

@@ -185,7 +185,7 @@ private function detectTestSuites(string $root, array $testDirs): array
             'statements' => ['break', 'continue', 'declare', 'return', 'throw', 'try'],
         ],
         'class_attributes_separation' => [
-            'elements' => ['method' => 'one', 'property' => 'one'],
+            'elements' => ['method' => 'one', 'property' => 'none'],
         ],
         'method_argument_space' => [
             'on_multiline' => 'ensure_fully_multiline',

tests/Unit/Core/ProjectContextTest.php

@@ -13,7 +13,6 @@
 final class ProjectContextTest extends TestCase
 {
     private ProjectContext $context;
-
     private string $root;
 
     protected function setUp(): void