fix: download artifacts from same branch to ensure correct binary version

Added 'branch: ${{ github.ref_name }}' parameter to dawidd6/action-download-artifact
to ensure the sync workflow downloads the binary built from the same branch it's
running on. Previously, it would download the most recent successful build from
any branch, which could use outdated code.

This ensures testing on feature branches uses the correct binary version.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: leogdion

.github/actions/cloudkit-sync/action.yml

@@ -143,6 +143,7 @@ runs:
         workflow_conclusion: success
         name: bushel-cloud-binary
         path: ./binary
+        branch: ${{ github.ref_name }}
 
     - name: Build binary (fallback if artifact unavailable)
       if: steps.download-binary.outcome != 'success'