[feat] Auto-remove claude-review label after CI review completes (#5983)

## Summary
Automatically removes the `claude-review` label after the Claude PR
review workflow completes, regardless of success or failure.

## Changes
- Added a cleanup step to `.github/workflows/claude-pr-review.yml` that
removes the label using `gh pr edit --remove-label`
- Uses `if: always()` to ensure the label is removed even if the review
fails
- This prevents label accumulation and allows the label to be re-applied
for additional reviews

## Benefits
- Cleaner PR label management
- Labels can be re-applied to trigger additional reviews without manual
cleanup
- Reduces noise in the PR interface

## Test Plan
- Apply the `claude-review` label to this PR to verify the workflow
removes it automatically after completion

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-5983-feat-Auto-remove-claude-review-label-after-CI-review-completes-2866d73d365081da929cd393996010e1)
by [Unito](https://www.unito.io)

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

@@ -86,3 +86,9 @@ jobs:
           COMMIT_SHA: ${{ github.event.pull_request.head.sha }}
           BASE_SHA: ${{ github.event.pull_request.base.sha }}
           REPOSITORY: ${{ github.repository }}
+
+      - name: Remove claude-review label
+        if: always()
+        run: gh pr edit ${{ github.event.pull_request.number }} --remove-label "claude-review"
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}