apparently janestreet style is to use double semicolons

# Cline's Notes

## Objective: Fix the `litedb` build

The user is experiencing a build failure with the `litedb` library. The error message "The module Litedb.Router is an alias for module Litedb__Router, which is missing" indicates a problem with how `dune` is resolving the modules within the library.

### What I've tried:

1.  **Adding `(modules ...)` to `litedb/dune`:** This was incorrect, as the `lib` directory works without it.
2.  **Creating `litedb/litedb.ml`:** This was also incorrect, as the `lib` directory doesn't have a main module file.
3.  **Modifying `bin/mainlite.ml`:** I've tried various ways of referencing the `Litedb` modules, but the error persists.

### What I've learned:

*   The `lib` and `litedb` directories have nearly identical `dune` files.
*   The `lib` directory works correctly without a main module file or an explicit `(modules ...)` stanza.
*   The error is specific to the `litedb` library.

### Next Steps:

I need to re-evaluate my understanding of how `dune` resolves modules. I will now try to run the application again, but this time I will pay close attention to the build output to see if there are any other clues that I've missed.