Where is `uv tool install az` installed, and why it cannot be uninstalled?

### Question

```console
$ uv tool install az
Resolved 1 package in 341ms
Prepared 1 package in 56ms
Installed 1 package in 4ms
 + az==0.1.0.dev1
No executables are provided by `az`
$ uv tool uninstall az
error: `az` is not installed
```

### Platform

Ubuntu 24.04.2 Linux 6.8.0-62-generic x86_64 GNU/Linux

### Version

uv 0.7.15