The configuration `caseFold` is not listed in `config.d.ts`

### @zenfs/core version 2.4.2 ### Host NodeJS 22 ### Minimal reproduction ```typescript In TypeScript try to call `configure()` with `caseFold: 'lower'` as a parameter ``` ### Logs _No response_ ### Expected behavior The type `Configuration` should support `caseFold` as documented ### Actual behavior <img width="1190" height="223" alt="Image" src="https://github.com/user-attachments/assets/45a9e8be-87b6-401e-907c-5f1265b7981e" /> ### Additional context _No response_