Skip Claude review on fork PRs (#559)

Fork PRs don't have access to secrets or OIDC tokens, causing
claude-code-action to fail on OIDC authentication. Skip the job
entirely for cross-repository PRs so CI stays green.

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

@@ -9,7 +9,8 @@ jobs:
     if: |
       github.event.pull_request.draft == false &&
       github.actor != 'dependabot[bot]' &&
-      github.event.pull_request.user.login != 'dependabot[bot]'
+      github.event.pull_request.user.login != 'dependabot[bot]' &&
+      github.event.pull_request.head.repo.full_name == github.repository
     runs-on: ubuntu-latest
     permissions:
       contents: read