Local sandbox on Windows failed to run command with error E_NOTIMPL

### Describe the bug

Enable local sandbox on Windows, and then try to run command, it would failed as below with error `Experimental_CreateProcessInSandbox returned E_NOTIMPL.`

```bash
╭─╮╭─╮
╰─╯╰─╯ Copilot v1.0.64-0 uses AI.
█ ▘▝ █ /experimental
▔▔▔▔

● Tip: /remote
└ Toggle remote control from GitHub web and mobile

● Sandboxing has been enabled.

❯ run dir command, if failed, give me error message

⌄ Thought for 1s
│ The user wants me to run the `dir` command. On Windows PowerShell, `dir` is an alias for `Get-ChildItem`, so it should work.

● SHELL Run dir command in home directory (sandboxed) 3 lines…
dir

● The  dir  command failed with the following error:

Experimental_CreateProcessInSandbox returned E_NOTIMPL.
The following velocity keys are not enabled: 61389575, 61155944.
Enable them and retry, or use schema version '0.4.0-alpha'
to fall back to the AppContainer backend.

This is a sandbox backend error — the sandbox environment couldn't create the process due to missing velocity keys. You may want to review your sandbox configuration using the  /sandbox  command.
```

### Affected version

v1.0.64-0

### Steps to reproduce the behavior

_No response_

### Expected behavior

_No response_

### Additional context

_No response_

Start by reproducing the failure on Windows with the local sandbox enabled, then inspect the sandbox configuration using the mentioned /sandbox command. The issue is resolved when a command such as dir runs successfully without the Experimental_CreateProcessInSandbox E_NOTIMPL error.

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