Assert required frontend steps before comparing their order

The omitted-unit-suite control raised ValueError instead of an assertion. Require each step exactly once before checking positions so the control reports the intended missing-check failure.

Contract-Neutral: Regression-test diagnostic only; the frontend workflow and all product contracts are unchanged.
Change-source: pulse-maintainer

scripts/tests/test_frontend_workflow_order.py

@@ -31,6 +31,8 @@ class FrontendWorkflowOrderTest(unittest.TestCase):
             "Frontend unit tests",
             "Require frontend dependency audit",
         ]
+        for name in ordered:
+            self.step(name)
         positions = [names.index(name) for name in ordered]
         self.assertEqual(positions, sorted(positions))