fix: allow code-review workflow to post PR comments

Change pull-requests permission from read to write so the
claude-code-action can post review comments.

Author: mindsocket

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

@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
     permissions:
       contents: read
-      pull-requests: read
+      pull-requests: write
       issues: read
       id-token: write