[FEATURE] Publish JSON schema for config.toml

What feature would you like to see?

Please publish an official JSON Schema for config.toml (and keep it versioned/updated with new keys like personality in v0.94). This would let TOML tooling like Taplo / Even Better TOML validate configs correctly without false errors.

Additional information

Right now Taplo flags personality as an unexpected property because there is no official schema to reference. A published schema URL would fix this and improve IDE validation/completions.

Even Better TOML extension for Cursor/VSCode throws this error now:

<img width="737" height="222" alt="Image" src="https://github.com/user-attachments/assets/14f2dc7e-50ca-455b-8bbc-65647155d46f" />

Related

Related but not the same: #1673 (schema for --json output).