Job: checks process status first to avoid blocking on Windows (thx Claude)

(Significant acceleration under Windows!!!)

Author: dg

src/Runner/Job.php

@@ -11,7 +11,7 @@
 
 use Tester\Helpers;
 use function count, is_array, is_resource;
-use const DIRECTORY_SEPARATOR;
+use const DIRECTORY_SEPARATOR, PHP_OS_FAMILY;
 
 
 /**
@@ -144,13 +144,15 @@ public function isRunning(): bool
 			return false;
 		}
 
-		$this->test->stdout .= stream_get_contents($this->stdout);
-
 		$status = proc_get_status($this->proc);
 		if ($status['running']) {
+			if (PHP_OS_FAMILY !== 'Windows') {
+				$this->test->stdout .= stream_get_contents($this->stdout);
+			}
 			return true;
 		}
 
+		$this->test->stdout .= stream_get_contents($this->stdout);
 		$this->duration += microtime(as_float: true);
 
 		fclose($this->stdout);