Assert route identity in http RouterTest

assertNotEquals deep-compares two different Route instances, and the
cyclic Route object graph overflows the stack under newer
sebastian/comparator releases (7.1.8). Router::match returns the
registered instance, so identity is the assertion that was meant.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: loks0n

tests/RouterTest.php

@@ -77,11 +77,11 @@ public function testCanMatchHttpMethod(): void
         Router::addRoute($routeGET);
         Router::addRoute($routePOST);
 
-        $this->assertEquals($routeGET, Router::match(Http::REQUEST_METHOD_GET, '/')?->route);
-        $this->assertEquals($routePOST, Router::match(Http::REQUEST_METHOD_POST, '/')?->route);
+        $this->assertSame($routeGET, Router::match(Http::REQUEST_METHOD_GET, '/')?->route);
+        $this->assertSame($routePOST, Router::match(Http::REQUEST_METHOD_POST, '/')?->route);
 
-        $this->assertNotEquals($routeGET, Router::match(Http::REQUEST_METHOD_POST, '/')?->route);
-        $this->assertNotEquals($routePOST, Router::match(Http::REQUEST_METHOD_GET, '/')?->route);
+        $this->assertNotSame($routeGET, Router::match(Http::REQUEST_METHOD_POST, '/')?->route);
+        $this->assertNotSame($routePOST, Router::match(Http::REQUEST_METHOD_GET, '/')?->route);
     }
 
     public function testCanMatchAlias(): void