[Bug] Migration tool fails to preserve access control policies

Question

**Bug Description**
This is dangerous behavior. Claude migrated my site but refuses to duplicate the existing access policies. This left the migrated site with full public access until I could get back to fix it myself.

**Environment Info**
- Platform: darwin
- Terminal: xterm-256color
- Version: 2.1.195
- Feedback ID: 0c8410ac-2375-4017-909c-5396664a62ec

**Errors**
```json
[]
```