refactor(dotfiles): inline registry validator

src/dotfiles/registry/validation.nix

@@ -3,17 +3,6 @@
   lib,
 }:
 let
-  assertValid =
-    data:
-    let
-      assertions = validationAssertions data;
-      failures = lib.filter (assertion: !assertion.assertion) assertions;
-    in
-    assert lib.assertMsg (lib.all (assertion: assertion.assertion) assertions) (
-      lib.concatMapStringsSep "\n" (assertion: assertion.message) failures
-    );
-    data;
-
   validationAssertions =
     data:
     lib.concatLists (
@@ -41,4 +30,12 @@ let
       ) data
     );
 in
-assertValid
+data:
+let
+  assertions = validationAssertions data;
+  failures = lib.filter (assertion: !assertion.assertion) assertions;
+in
+assert lib.assertMsg (lib.all (assertion: assertion.assertion) assertions) (
+  lib.concatMapStringsSep "\n" (assertion: assertion.message) failures
+);
+data