Enhance configuration schema with descriptive text for all fields to improve developer experience and auto-generated documentation.
🤖 Generated with [opencode](https://opencode.ai)
Co-Authored-By: opencode <noreply@opencode.ai>
We have changed the config format yet again - but this should be the
final time. You can see the readme for more details but the summary is
- got rid of global providers config
- got rid of global toml
- global config is now in `~/.config/opencode/config.json`
- it will be merged with any project level config
