{command} is not recognized as an internal or external command, operable program or batch file. in PowerShell 7

I do not seem to be able to run commands in PowerShell 7.3.6 in Windows Terminal 1.17.11461.0 on Windows 10 21H2 (19044.3208).

Example:
```
❯ ai get all image files

┌ AI Shell
│
◇ Your script:

Get-ChildItem -Path "C:\Path\to\folder" -Include *.jpg, *.png, *.gif -Recurse

•
│
◇ Explanation:

- Set the path to "C:\Path\to\folder"
- Include only files with extensions *.jpg, *.png, and *.gif
- Enable recursion to search for files in subfolders as well

•
│
◇ Run this script?
│ ✅ Yes
│
└ Running:
Get-ChildItem -Path "C:\Path\to\folder" -Include *.jpg, *.png, *.gif -Recurse

'Get-ChildItem' is not recognized as an internal or external command,
operable program or batch file.
```

Reproduce the example with PowerShell 7.3.6 in Windows Terminal 1.17.11461.0 on Windows 10 21H2, then trace the CLI's command-execution entry point. The issue names no source file or test; done means the generated Get-ChildItem command runs in PowerShell without the cmd.exe-style error.

Written by the indexing model from the issue text.