Add workflow templates for code and security reviews

- Add Claude code review workflows (custom and standard)
- Add pragmatic code review slash command and subagent
- Add security review slash command
- Add security workflow template

security-review/security.yml

@@ -0,0 +1,24 @@
+name: Security Review
+
+permissions:
+  pull-requests: write  # Needed for leaving PR comments
+  contents: read
+
+on:
+  pull_request:
+
+jobs:
+  security:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          ref: ${{ github.event.pull_request.head.sha || github.sha }}
+          fetch-depth: 2
+      
+      - uses: anthropics/claude-code-security-review@main
+        with:
+          comment-pr: true
+          claude-api-key: ${{ secrets.ANTHROPIC_API_KEY }}
+          claude-model: claude-opus-4-1-20250805
+          custom-security-scan-instructions: "" # Add any custom instructions specific to your codebase here.