Syncing working directory - endless loop

Default cirrus script with Tart Image. Run Tart VM without cirrus, VM starts all good. If i use cirrus to start VM, i got message syncing working directory which blocks VM to start.

```
task:
name: xCode Build
macos_instance:
image: ghcr.io/cirruslabs/macos-ventura-base:latest
task_script:
- echo "Hello from within a Tart VM!"
```

```
🕙 'xCode Build' task 03:39
✅ pull virtual machine 0.5s
✅ clone virtual machine 0.1s
✅ boot virtual machine 6.3s
🕙 syncing working directory 03:27
```

Reproduce the issue with the provided Cirrus task and Tart image, then trace the CLI path responsible for “syncing working directory.” Confirm why the sync does not finish and verify that the same task reaches task_script and prints the expected message without looping.

Written by the indexing model from the issue text.