fix: grant write permissions to Claude Code review action

Without write access on pull-requests and issues, the action cannot
post review comments on PRs.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: kevin1chun

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

@@ -21,8 +21,8 @@ jobs:
     runs-on: ubuntu-latest
     permissions:
       contents: read
-      pull-requests: read
-      issues: read
+      pull-requests: write
+      issues: write
       id-token: write
 
     steps: