ci(cards): test @hanzo/cards; workspace includes packages/cards

The shared card-builder — one canonical PanelSpec → Slack Block Kit / Teams
Adaptive Cards / Google CardService with stable action ids. The missing
foundation piece for card-host adapters (Slack/Teams/Google); pairs with the
existing @hanzo/ai (headless client) + @hanzo/iam (identity) SDKs. Pure, zero
runtime deps, 66 tests.

.github/workflows/ci.yml

@@ -48,6 +48,9 @@ jobs:
     - name: Test Clio integration
       run: pnpm --filter @hanzo/clio test
 
+    - name: Test cards (shared card-builder)
+      run: pnpm --filter @hanzo/cards test
+
     - name: Test tools package
       run: pnpm --filter @hanzo/cli-tools test