add parametric includes for host/user/home

[vic]

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[Copilot]

Pull Request Overview

This PR refactors the aspect dependency system to introduce a new parametric includes mechanism. Instead of directly including dependencies, aspects now define _.host.includes, _.user.includes, and _.home.includes lists that are invoked with the appropriate context parameters. This enables more flexible aspect composition by allowing aspects to be added to specific hosts, users, or homes without modifying the defaults.

Key Changes

• Refactored hostAspect, userAspect, and homeAspect functions to support parametric includes via aspect._.*.includes attributes
• Updated comments and documentation to reflect the new invocation pattern
• Added example showing how to add a parametric aspect to a specific home configuration

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
modules/aspects/dependencies.nix	Refactored aspect creation functions to support parametric includes mechanism with _.host.includes, _.user.includes, and _.home.includes
templates/default/modules/_example/aspects.nix	Added example demonstrating how to add parametric aspects to specific home configurations
modules/aspects/batteries/home-manager.nix	Updated documentation to reflect new syntax for adding home-manager to specific hosts

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