Check a flake is dendritic: flake-parts + import-tree over modules/

A quick way to confirm a NixOS flake follows the dendritic pattern: flake.nix outputs inputs.flake-parts.lib.mkFlake {inherit inputs;} (inputs.import-tree ./modules), so every .nix under modules/ is a flake-parts module auto-imported with no manual imports. Feature folders contribute to both flake.nixosModules.<feature> and flake.homeModules.<feature> (several files merge into the same attr), hosts only compose feature modules and set shared fact options (e.g. my.* declared once and forwarded to home-manager via sharedModules). Use import-tree.matchNot to exclude non-module trees such as an embedded nvim Lua config.