ci: bootstrap claude code review workflow (#2)

## Summary

- Adds the Claude Code Review workflow to `main` so it can validate and
run on PRs

The workflow validation requires the file to exist on the default branch
with identical content. Since PR #1 introduces the workflow file for the
first time, it can't validate against `main`. This small PR bootstraps
it.

## Test plan

- [ ] Merge this PR
- [ ] Push a new commit to PR #1 — claude-review should post feedback

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude Opus 4.6 <[email protected]>

Author: justin-layerv

.github/workflows/claude-code-review.yml

@@ -0,0 +1,42 @@
+name: Claude Code Review
+
+on:
+  pull_request:
+    types: [opened, synchronize]
+
+jobs:
+  claude-review:
+    if: github.actor != 'dependabot[bot]'
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      pull-requests: read
+      issues: read
+      id-token: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          fetch-depth: 1
+
+      - name: Run Claude Code Review
+        uses: anthropics/claude-code-action@1fc90f3ed982521116d8ff6d85b948c9b12cae3e # v1
+        with:
+          anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}
+          prompt: |
+            REPO: ${{ github.repository }}
+            PR NUMBER: ${{ github.event.pull_request.number }}
+
+            Please review this pull request and provide feedback on:
+            - Code quality and best practices
+            - Potential bugs or issues
+            - Performance considerations
+            - Security concerns
+            - Test coverage
+
+            Use the repository's CLAUDE.md for guidance on style and conventions. Be constructive and helpful in your feedback.
+
+            Use `gh pr comment` with your Bash tool to leave your review as a comment on the PR.
+
+          claude_args: '--model claude-opus-4-6 --allowed-tools "Bash(gh issue view:*),Bash(gh search:*),Bash(gh issue list:*),Bash(gh pr comment:*),Bash(gh pr diff:*),Bash(gh pr view:*),Bash(gh pr list:*)"'