feat: Importable import-tree objects.

[vic]

No description provided.

[Copilot]

Pull Request Overview

This PR introduces importable import-tree objects by adding new module files, enhancing the functor evaluation logic in default.nix, and updating tests and documentation.

• Added a basic module in hello-world and an options module in hello-option
• Modified default.nix to support conditional evaluation based on whether the import is a module
• Added tests in checkmate.nix and updated README.md to reflect the API changes

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tree/modules/hello-world/mod.nix	Added a basic module with a simple attribute
tree/modules/hello-option/mod.nix	Introduced a new options module using lib.mkOption
default.nix	Updated functor and callable logic to support additional configuration args and module imports
checkmate.nix	Added tests to validate module evaluation and functional API usage
README.md	Updated documentation to describe the new API and usage patterns

Comments suppressed due to low confidence (1)

default.nix:62

• Consider adding inline comments to explain the rationale behind the new functor logic, especially the use of 'builtins.isAttrs args' to differentiate module imports from direct evaluations.

    self: args: