x/tools/present: version flag

### Go version

go version go1.24.4 darwin/arm64

### Output of `go env` in your module/workspace:

```shell
N.a.
```

### What did you do?

present -v, --version etc.

### What did you see happen?

present --version, version, -v etc. does not show the installed version of present

### What did you expect to see?

the version of the installed `present` binary