remove den and flake-aspects

[vic]

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[Copilot]

Pull request overview

This PR removes two unused Nix flake dependencies (den and flake-aspects) from the project, cleaning up the dependency graph and reducing maintenance overhead.

• Removes den and flake-aspects input declarations from both root and template flake configurations
• Removes the corresponding .follows references in checkmate input configurations
• Updates lock files to reflect the removed dependencies and refreshes several other dependency versions

Reviewed changes

Copilot reviewed 3 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
flake.nix	Removes den and flake-aspects input declarations from the root flake
flake.lock	Removes lock file entries for den and flake-aspects and updates dependency hashes
templates/dendritic/checkmate/flake.nix	Removes den and flake-aspects input declarations and their .follows references in the checkmate input
templates/dendritic/checkmate/flake.lock	Removes lock file entries for den and flake-aspects and updates dependency hashes
modules/flakeModule.nix	Removes .follows references to den and flake-aspects in the checkmate input configuration

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