Refactor fetch implementation to use isomorphic-fetch, update depende…

…ncies, and enhance error handling in AnthropicModel

.github/workflows/npm-test.yml

@@ -0,0 +1,24 @@
+name: NPM Test
+
+on:
+  push:
+    branches:
+      - main
+      - dev
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '22'
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Run tests
+        run: npm run test:ci