Host Dual Loader

Same page loads wrapper script twice — second loader should bail out

host
  ├── <script> prod loader  [1st — should load normally]
  └── <script> prod loader  [2nd — should bail out]

Test: two <script> tags for the same wrapper loader on the same page.
Expected: only one wrapper instance runs, second detects duplicate and exits.
Check console for "[HBMP-CF] duplicate loader detected — bailing out".