refactor: move benchmark directory under test and update all references

The benchmark directory is relocated from the project root into the test directory, and all scripts, documentation links, and gitignore paths are updated accordingly. The test runner is also refactored to explicitly walk subdirectories (core, io, language, limit) instead of using a single test root, and a new test/README.md is added to document the test suite structure. Additionally, the constructor test for the Foo class is updated to add a zero-arity constructor and adjust expected output strings.

test/language/nonlocal/assignment.wren

@@ -0,0 +1,18 @@
+var Nonlocal = "before"
+IO.print(Nonlocal) // expect: before
+Nonlocal = "after"
+IO.print(Nonlocal) // expect: after
+
+class Foo {
+  static method {
+    Nonlocal = "method"
+  }
+}
+
+Foo.method
+IO.print(Nonlocal) // expect: method
+
+new Fn {
+  Nonlocal = "fn"
+}.call()
+IO.print(Nonlocal) // expect: fn

test/language/nonlocal/duplicate_nonlocal.wren

@@ -0,0 +1,6 @@
+class Foo {
+  bar {
+    var A = "value"
+    var A = "other" // expect error
+  }
+}

test/language/nonlocal/in_block_scope.wren

@@ -0,0 +1,8 @@
+var Nonlocal = "outer"
+
+{
+  var Nonlocal = "inner"
+  IO.print(Nonlocal) // expect: inner
+}
+
+IO.print(Nonlocal) // expect: outer

test/language/nonlocal/mutual_recursion.wren

@@ -0,0 +1,10 @@
+class Foo {
+  static bar { new Bar }
+}
+
+class Bar {
+  static foo { new Foo }
+}
+
+IO.print(Foo.bar) // expect: instance of Bar
+IO.print(Bar.foo) // expect: instance of Foo

test/language/nonlocal/null_before_defined.wren

@@ -0,0 +1,3 @@
+IO.print(Foo) // expect: null
+var Foo = "value"
+IO.print(Foo) // expect: value

test/language/nonlocal/undefined.wren

@@ -0,0 +1,7 @@
+var fn = new Fn {
+  IO.print(Foo)
+  IO.print(Bar)
+}
+
+// expect error line 7
+// expect error line 7

test/language/nonlocal/use_in_function.wren

@@ -0,0 +1,5 @@
+var Global = "global"
+
+new Fn {
+  IO.print(Global) // expect: global
+}.call()

test/language/nonlocal/use_in_function_before_definition.wren

@@ -0,0 +1,7 @@
+var f = new Fn {
+  IO.print(Global)
+}
+
+var Global = "global"
+
+f.call() // expect: global

test/language/nonlocal/use_in_method.wren

@@ -0,0 +1,14 @@
+var Global = "global"
+
+class Foo {
+  method {
+    IO.print(Global)
+  }
+
+  static classMethod {
+    IO.print(Global)
+  }
+}
+
+(new Foo).method // expect: global
+Foo.classMethod // expect: global

test/language/nonlocal/use_in_method_before_definition.wren

@@ -0,0 +1,14 @@
+class Foo {
+  method {
+    IO.print(Global)
+  }
+
+  static classMethod {
+    IO.print(Global)
+  }
+}
+
+var Global = "global"
+
+(new Foo).method // expect: global
+Foo.classMethod // expect: global