refactor(flake): qualify nixpkgs lib calls

flake/default.nix

@@ -4,28 +4,19 @@
   self,
 }:
 let
-  inherit (lib)
-    attrNames
-    filterAttrs
-    genAttrs
-    flatten
-    hasSuffix
-    mapAttrsToList
-    ;
-
   registryAssembly = import ./registry.nix { inherit lib self; };
 
   collectNixFiles =
     dir:
-    flatten (
-      mapAttrsToList (
+    lib.flatten (
+      lib.mapAttrsToList (
         name: type:
         let
           path = dir + "/${name}";
         in
         if type == "directory" then
           collectNixFiles path
-        else if type == "regular" && hasSuffix ".nix" name then
+        else if type == "regular" && lib.hasSuffix ".nix" name then
           [ path ]
         else
           [ ]
@@ -96,9 +87,9 @@ let
   mkHosts =
     hostsDir:
     let
-      hostNames = attrNames (filterAttrs (_name: type: type == "directory") (builtins.readDir hostsDir));
+      hostNames = lib.attrNames (lib.filterAttrs (_name: type: type == "directory") (builtins.readDir hostsDir));
     in
-    genAttrs hostNames (hostName: mkHost { inherit hostName; });
+    lib.genAttrs hostNames (hostName: mkHost { inherit hostName; });
 in
 {
   inherit mkHosts;