refactor(natu): rename xatu

src/natu/testdata/clean.nix

@@ -0,0 +1,29 @@
+{ pkgs }:
+
+let
+  first = 1;
+  second = first;
+in {
+  firstField = first;
+  secondField = second;
+  nested = let
+    innerSecond = innerFirst;
+    innerFirst = first;
+  in {
+    result = innerSecond;
+  };
+  parameter = first: let
+    usesParameter = first;
+  in {
+    result = usesParameter;
+  };
+  path = ./. + "/foo";
+  url = "https://example.com";
+  inherit pkgs;
+  different = other;
+  nested.package = nested.package;
+  "quoted" = quoted;
+  ${dynamic} = dynamic;
+  from = pkgs.from.other;
+  fallback = pkgs.fallback or null;
+}

src/natu/testdata/invalid.nix

@@ -0,0 +1,4 @@
+{ pkgs }:
+
+{
+  inherit pkgs;

src/natu/testdata/lint_findings.nix

@@ -0,0 +1,17 @@
+let
+  second = first;
+  first = 1;
+  nested = let
+    nestedFirst = first;
+    nestedSecond = nestedFirst;
+  in {
+    result = nestedSecond;
+  };
+in {
+  package = package;
+  from = pkgs.from;
+  url = https://example.com;
+  firstField = first;
+  secondField = second;
+  nestedField = nested;
+}