Add tfx-cli installation to CI workflow

The package-dev script requires tfx-cli to create the .vsix package.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: BenGWeeks

.github/workflows/ci.yml

@@ -22,6 +22,9 @@ jobs:
       - name: Install dependencies
         run: bun install
 
+      - name: Install tfx-cli
+        run: npm install -g tfx-cli
+
       - name: Run lint
         run: bun run lint