ci: add Claude assistant GitHub Actions workflow

.github/workflows/claude.yml

@@ -0,0 +1,31 @@
+name: Claude Assistant
+
+on:
+  issue_comment:
+    types: [created]
+  pull_request_review_comment:
+    types: [created]
+  issues:
+    types: [opened, assigned, labeled]
+  pull_request_review:
+    types: [submitted]
+
+jobs:
+  claude-response:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: "20"
+
+      - name: Install sandbox-agent skill
+        run: npx skills add https://sandboxagent.dev/docs --yes
+
+      - name: Run Claude
+        uses: anthropics/claude-code-action@v1
+        with:
+          anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}