feat(ci): add npx smoke test to verify installability

.github/workflows/ci.yml

@@ -177,6 +177,15 @@ jobs:
       - name: 'Smoke test bundle'
         run: 'node ./bundle/gemini.js --version'
 
+      - name: 'Smoke test npx installation'
+        run: |
+          # Create a temporary directory to avoid picking up local node_modules
+          mkdir -p ../npx-test
+          cd ../npx-test
+          # Run npx pointing to the checkout directory. This simulates a user
+          # installing the package from a git reference.
+          npx ${{ github.workspace }} --version
+
       - name: 'Wait for file system sync'
         run: 'sleep 2'
 
@@ -252,6 +261,15 @@ jobs:
       - name: 'Smoke test bundle'
         run: 'node ./bundle/gemini.js --version'
 
+      - name: 'Smoke test npx installation'
+        run: |
+          # Create a temporary directory to avoid picking up local node_modules
+          mkdir -p ../npx-test
+          cd ../npx-test
+          # Run npx pointing to the checkout directory. This simulates a user
+          # installing the package from a git reference.
+          npx ${{ github.workspace }} --version
+
       - name: 'Wait for file system sync'
         run: 'sleep 2'
 
@@ -396,6 +414,16 @@ jobs:
         run: 'node ./bundle/gemini.js --version'
         shell: 'pwsh'
 
+      - name: 'Smoke test npx installation'
+        run: |
+          # Create a temporary directory to avoid picking up local node_modules
+          New-Item -ItemType Directory -Force -Path ../npx-test
+          Set-Location ../npx-test
+          # Run npx pointing to the checkout directory. This simulates a user
+          # installing the package from a git reference.
+          npx ${{ github.workspace }} --version
+        shell: 'pwsh'
+
   ci:
     name: 'CI'
     if: 'always()'