chore(ci): add aggregator job reporting the org-required 'ci / ci' context (#49)

exec-aide's caller jobs are named python/typescript, so the org ruleset's
required 'ci / ci' status check never reported here and every PR was
merge-blocked for non-admins. The aggregator needs all real CI jobs and
fails if any failed or was cancelled.

.github/workflows/ci.yaml

@@ -13,3 +13,15 @@ jobs:
     uses: Sea-Haven-Industries/.github/.github/workflows/ci-typescript-cdk.yaml@main
     with:
       run-cdk-synth: false
+  # Aggregator producing the org-required "ci / ci" status context.
+  # Caller jobs here have distinct names (python, typescript), so the
+  # org ruleset's required check would otherwise never report.
+  ci:
+    name: ci / ci
+    needs: [python, typescript]
+    if: always()
+    runs-on: ubuntu-latest
+    steps:
+      - name: All CI jobs passed
+        run: |
+          [ "${{ contains(needs.*.result, 'failure') || contains(needs.*.result, 'cancelled') }}" = "false" ]