refactor(tests): remove redundant tests and fix assertion style

Remove subset/duplicate architecture tests already covered by broader
checks, and replace assertTrue(true) with self::addToAssertionCount(1)
for explicit no-exception-thrown intent.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

tests/Service/Security/RateLimiterServiceTest.php

@@ -305,7 +305,7 @@ class RateLimiterServiceTest extends TestCase
 
         // Should not throw — exceptions are silently ignored.
         $this->service->reset('login', 'user@example.com');
-        $this->assertTrue(true);
+        self::addToAssertionCount(1);
     }
 
     public function testResetWithEmptyScopeDoesNothing(): void