BuildCtx

Register a compute value as watched during module initialization, so Mill knows that if the value changes during --watch the module needs to be re-instantiated.

Disable Mill's filesystem read/write checker, which normally enforces best practices about what code or tasks are able to read and write to what locations on disk.

This is the os.Path pointing to the project root directory.

This is the preferred access to the project directory, and should always be preferred over os.pwd* (which might also point to the project directory in classic cli scenarios, but might not in other use cases like BSP or LSP server usage).