fix(test): terminate SpecRunner's own PhNode on page reload

The beforeunload handler only terminated the test iframe's PhNode but
not the SpecRunner's own process, leaving orphaned phnode processes
after every test runner reload.

Author: abose

test/spec/SpecRunnerUtils.js

@@ -67,6 +67,15 @@ define(function (require, exports, module) {
                 // ignore — test window may already be torn down
             }
         }
+        // Also terminate the SpecRunner's own PhNode process so it
+        // doesn't become an orphan on page reload.
+        if (window.PhNodeEngine) {
+            try {
+                window.PhNodeEngine.terminateNode();
+            } catch (e) {
+                // ignore
+            }
+        }
     });
 
     function _getFileSystem() {