fix(webui): tighten PR #856 remediation docs and nav assertions (#646)

Clarify that Policy is live (not a Phase 1 placeholder) in shell docs and
nav module docstring. Strengthen the Policy nav graduation test to assert
status=live and absence of the nav-stub CSS class.

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

tests/test_webui_policy_visibility.py

@@ -214,11 +214,16 @@ class TestPolicyRoutes(unittest.TestCase):
         self.assertIn(response.status_code, (404, 405))
 
     def test_nav_links_policy(self):
-        from webui.nav import STUB_PAGES
+        # Policy is graduated live: not in STUB_PAGES and not labeled ·stub in nav.
+        from webui.nav import STUB_PAGES, iter_nav_items
+
         self.assertNotIn("/policy", STUB_PAGES)
+        policy_items = [i for i in iter_nav_items() if i.href == "/policy"]
+        self.assertEqual(len(policy_items), 1)
+        self.assertEqual(policy_items[0].status, "live")
         text = self.client.get("/").text
         self.assertIn('href="/policy">Policy</a>', text)
-        self.assertNotIn('href="/policy">Policy</a> <span class="muted">(stub)</span>', text)
+        self.assertNotIn('href="/policy" class="nav-stub"', text)
 
 
 class TestPolicyViewFailSoft(unittest.TestCase):