Make Http::setRoute private

Only the framework itself called setRoute (internal cache plumbing in
match() and the wildcard branch). Drop it from the public API and the
self-referential test.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: loks0n

src/Http/Http.php

@@ -461,14 +461,9 @@ public function getRoute(): ?Route
         return $container->has('route') ? $container->get('route') : null;
     }
 
-    /**
-     * Set the current route
-     */
-    public function setRoute(?Route $route): self
+    private function setRoute(?Route $route): void
     {
         $this->server->getContainer()->set('route', fn() => $route);
-
-        return $this;
     }
 
     /**

tests/HttpTest.php

@@ -366,15 +366,6 @@ public function testCanHookThrowExceptions(): void
         $this->assertSame('(init)-y-def-x-def-(shutdown)', $result);
     }
 
-    public function testCanSetRoute(): void
-    {
-        $route = new Route('GET', '/path');
-
-        $this->assertNull($this->http->getRoute());
-        $this->http->setRoute($route);
-        $this->assertSame($route, $this->http->getRoute());
-    }
-
     /**
      * @return \Iterator<string, array<int, string>>
      */