ci: add package install sanity check to build-and-test

Author: Hweinstock

.github/workflows/build-and-test.yml

@@ -50,6 +50,12 @@ jobs:
       - name: Pack tarball
         if: matrix.node-version == '20.x'
         run: npm pack
+      - name: Install from tarball
+        if: matrix.node-version == '20.x'
+        run: npm install -g aws-agentcore-*.tgz
+      - name: Verify packaged CLI runs
+        if: matrix.node-version == '20.x'
+        run: agentcore --version
       - name: Upload tarball artifact
         if: matrix.node-version == '20.x'
         uses: actions/upload-artifact@v7