perf: eliminate per-scan closure allocation and dead name lookup in detection

src/Detection/ConsumedUsageVisitor.php

@@ -174,10 +174,9 @@ private function addName(?Name $name): void
             return;
         }
 
-        $resolvedName = $name->getAttribute('resolvedName');
-        $className    = $resolvedName instanceof Name ? $resolvedName->toString() : $name->toString();
-
-        $this->addUsage($className);
+        // NameResolver runs with replaceNodes = true, so names are already resolved
+        // in place and toString() yields the fully-qualified name.
+        $this->addUsage($name->toString());
     }
 
     private function addFunctionName(Name $name): void

src/Detection/TestUsageScanner.php

@@ -24,6 +24,9 @@
 
     private Parser $parser;
 
+    /** @var Closure(string): ScanResult */
+    private Closure $scanFactory;
+
     /**
      * @param null|Closure(string): (string|false) $readFile
      */
@@ -35,14 +38,12 @@ public function __construct(
         $this->consumedUsageExtractor = $consumedUsageExtractor ?? new ConsumedUsageExtractor();
         $this->scanResultCache        = $scanResultCache ?? new ScanResultCache();
         $this->parser                 = (new ParserFactory())->createForNewestSupportedVersion();
+        $this->scanFactory            = fn (string $className): ScanResult => $this->scanUncached($className);
     }
 
     public function scan(string $testClassName): ScanResult
     {
-        return $this->scanResultCache->get(
-            $testClassName,
-            fn (string $className): ScanResult => $this->scanUncached($className)
-        );
+        return $this->scanResultCache->get($testClassName, $this->scanFactory);
     }
 
     private function scanUncached(string $testClassName): ScanResult