ci: add examples-chat-e2e-summary aggregator job (#523)

PR #521 sharded the singular `examples/chat — e2e` job into a 4-way
matrix. The singular check name is no longer reported, which would
break any external reference (status badges, branch protection rules,
deploy gates that read by name).

This mirrors the existing `cockpit-e2e-summary` pattern (lines
334-345 — fan-in over the cockpit matrix): a no-op aggregator named
`examples/chat — e2e` that gates on the matrix's aggregated result.
Restores the singular check name without undoing the matrix.

needs: [ci-scope, examples-chat-e2e] — ci-scope must be in needs for
the if-guard to access its outputs (GitHub Actions only exposes
needs.<job>.outputs for jobs in the explicit needs list).

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: blove

.github/workflows/ci.yml

@@ -274,6 +274,20 @@ jobs:
             examples/chat/angular/e2e/test-results/
           retention-days: 7
 
+  examples-chat-e2e-summary:
+    name: "examples/chat — e2e"
+    needs: [ci-scope, examples-chat-e2e]
+    if: always() && (github.event_name == 'push' || needs.ci-scope.outputs.examples_chat == 'true')
+    runs-on: ubuntu-latest
+    steps:
+      - name: Aggregate matrix outcome
+        run: |
+          if [[ "${{ needs.examples-chat-e2e.result }}" != "success" ]]; then
+            echo "Matrix outcome: ${{ needs.examples-chat-e2e.result }}"
+            exit 1
+          fi
+          echo "All examples-chat-e2e matrix expansions passed."
+
   cockpit-e2e:
     name: "Cockpit — e2e (${{ matrix.cap.angular }})"
     needs: ci-scope