Fix public to internal sync remote

Point the sync workflow at atomicstrata/atomicmemory-internal using the configured sync token.

Author: ethanj

.github/workflows/sync-to-private.yml

@@ -21,7 +21,7 @@ jobs:
           git config --global user.email "actions@github.com"
 
           # Add the atomicmemory-internal repository as a secure remote
-          git remote add private-target https://x-access-token:${{ secrets.SYNC_TOKEN }}@://github.com
+          git remote add private-target https://x-access-token:${{ secrets.SYNC_TOKEN }}@github.com/atomicstrata/atomicmemory-internal.git
 
           # Force push the main branch to the private repo to ensure perfect alignment
           git push private-target main --force