ci: add Polaris RBAC apply and readiness check to E2E workflow

The E2E tests fail because the CI runner lacks RBAC permissions to
proxy to the Polaris dashboard service. Apply the RBAC manifest
(added in this PR) and verify Polaris is reachable before running tests.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.github/workflows/e2e.yaml

@@ -25,6 +25,14 @@ jobs:
       - name: Install dependencies
         run: npm ci
 
+      - name: Configure RBAC for Polaris dashboard proxy access
+        run: kubectl apply -f deployment/polaris-rbac.yaml
+
+      - name: Verify Polaris dashboard is reachable
+        run: |
+          kubectl wait --for=condition=ready pod -l app.kubernetes.io/name=polaris -n polaris --timeout=120s
+          kubectl get svc polaris-dashboard -n polaris
+
       - name: Install Playwright browsers
         run: npx playwright install --with-deps chromium