Use sticky comment for Claude PR review instead of creating new comments

Enable `use_sticky_comment` to update the existing review comment in
place on subsequent pushes, instead of creating a new comment each time.
Also add `reopened` trigger for completeness.

Author: tim4724

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

@@ -2,7 +2,7 @@ name: Claude Code Review
 
 on:
   pull_request:
-    types: [opened, synchronize]
+    types: [opened, synchronize, reopened]
     # Optional: Only run on specific file changes
     # paths:
     #   - "src/**/*.ts"
@@ -36,10 +36,8 @@ jobs:
         uses: anthropics/claude-code-action@v1
         with:
           claude_code_oauth_token: ${{ secrets.CLAUDE_CODE_OAUTH_TOKEN }}
+          use_sticky_comment: "true"
           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
@@ -49,9 +47,6 @@ jobs:
 
             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.
-
           # See https://github.com/anthropics/claude-code-action/blob/main/docs/usage.md
           # or https://code.claude.com/docs/en/cli-reference for available options
           claude_args: '--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:*)"'
-