Add typecheck/linting to github cicd

.github/workflows/agentex-ui-lint-typecheck.yml

@@ -0,0 +1,42 @@
+name: "Agentex UI - Lint & Typecheck"
+
+on:
+  pull_request:
+    branches: [ main ]
+    # Run lint and typecheck on any changes to agentex-ui code or workflow
+    paths:
+      - 'agentex-ui/**'
+      - '.github/workflows/agentex-ui-lint-typecheck.yml'
+
+jobs:
+  lint-and-typecheck:
+    name: "Lint and Typecheck"
+    runs-on: ubuntu-latest
+
+    steps:
+    # Checkout the repository
+    - name: Checkout
+      uses: actions/checkout@v4
+
+    # Set up Node.js
+    - name: Set up Node.js
+      uses: actions/setup-node@v4
+      with:
+        node-version: '20'
+        cache: 'npm'
+        cache-dependency-path: './agentex-ui/package-lock.json'
+
+    # Install dependencies
+    - name: Install dependencies
+      run: npm ci
+      working-directory: ./agentex-ui
+
+    # Run TypeScript type checking
+    - name: Run typecheck
+      run: npm run typecheck
+      working-directory: ./agentex-ui
+
+    # Run ESLint
+    - name: Run lint
+      run: npm run lint
+      working-directory: ./agentex-ui