🔧(ci) introduce Claude security review GitHub Action

Add automated security review on new pull requests to strengthen
early detection of potential vulnerabilities.

Leverage Claude to help identify security issues and highlight
areas requiring special attention.

.github/workflows/security.yaml

@@ -0,0 +1,29 @@
+# /!\
+# Security Note: This action is not hardened against prompt injection attacks and should only be used
+# to review trusted PRs. Configure your repository with "Require approval for all external contributors"
+# to ensure workflows only run after a maintainer has reviewed the PR.
+name: Security Review
+
+permissions:
+  pull-requests: write  # Needed for leaving PR comments
+  contents: read
+
+on:
+  pull_request:
+    branches:
+      - 'main'
+
+jobs:
+  security:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+        with:
+          ref: ${{ github.event.pull_request.head.sha || github.sha }}
+          fetch-depth: 2
+
+      - uses: anthropics/claude-code-security-review@0c6a49f1fa56a1d472575da86a94dbc1edb78eda
+        with:
+          comment-pr: true
+          exclude-directories: docs,gitlint,LICENSES,bin
+          claude-api-key: ${{ secrets.CLAUDE_API_KEY }}