OpenCode crashes when adding log_level to the configuration

Setting the "log_level" parameter (per https://opencode.ai/docs/config/#logging) in the config file causes this message:
```
Error: Config file at /home/.../.config/opencode/opencode.json is invalid
↳ Unrecognized key(s) in object: 'log_level'
```

```
{
  "$schema": "https://opencode.ai/config.json",
  "log_level": "DEBUG",
  "provider": {
...
```

Thank you for all the good work!