feat: require parentheses around operator and setter method parameters in Wren

Enforce syntactic requirement for parentheses in operator method signatures (e.g., `+(other)` instead of `+ other`) and setter definitions (e.g., `bar=(value)` instead of `bar = value`). Update the compiler's `infixSignature`, `mixedSignature`, and `namedSignature` functions to consume explicit `(` and `)` tokens around parameter names. Migrate all built-in core library operator definitions and test fixtures to the new parenthesized syntax.

test/constructor/infix_class_expression.wren

@@ -1,5 +1,5 @@
 class Foo {
-  + other { "Foo " + other }
+  +(other) { "Foo " + other }
 }
 
 IO.print(new Foo + "value") // expect: Foo value

test/implicit_receiver/inherited_methods.wren

@@ -3,7 +3,7 @@ class Foo {
     IO.print("getter")
   }
 
-  setter = value {
+  setter=(value) {
     IO.print("setter")
   }
 

test/implicit_receiver/instance_methods.wren

@@ -3,7 +3,7 @@ class Foo {
     IO.print("getter")
   }
 
-  setter = value {
+  setter=(value) {
     IO.print("setter")
   }
 

test/implicit_receiver/locals_shadow_setter.wren

@@ -1,5 +1,5 @@
 class Foo {
-  bar = value {
+  bar=(value) {
     IO.print("setter")
     return value
   }

test/implicit_receiver/nested_class.wren

@@ -3,7 +3,7 @@ class Outer {
     IO.print("outer getter")
   }
 
-  setter = value {
+  setter=(value) {
     IO.print("outer setter")
   }
 
@@ -21,7 +21,7 @@ class Outer {
         IO.print("inner getter")
       }
 
-      setter = value {
+      setter=(value) {
         IO.print("inner setter")
       }
 

test/implicit_receiver/static_methods.wren

@@ -3,7 +3,7 @@ class Foo {
     IO.print("getter")
   }
 
-  static setter = value {
+  static setter=(value) {
     IO.print("setter")
   }
 

test/method/operators.wren

@@ -1,17 +1,17 @@
 class Foo {
-  + other { "infix + " + other }
-  - other { "infix - " + other }
-  * other { "infix * " + other }
-  / other { "infix / " + other }
-  % other { "infix % " + other }
-  < other { "infix < " + other }
-  > other { "infix > " + other }
-  <= other { "infix <= " + other }
-  >= other { "infix >= " + other }
-  == other { "infix == " + other }
-  != other { "infix != " + other }
-  & other { "infix & " + other }
-  | other { "infix | " + other }
+  +(other) { "infix + " + other }
+  -(other) { "infix - " + other }
+  *(other) { "infix * " + other }
+  /(other) { "infix / " + other }
+  %(other) { "infix % " + other }
+  <(other) { "infix < " + other }
+  >(other) { "infix > " + other }
+  <=(other) { "infix <= " + other }
+  >=(other) { "infix >= " + other }
+  ==(other) { "infix == " + other }
+  !=(other) { "infix != " + other }
+  &(other) { "infix & " + other }
+  |(other) { "infix | " + other }
 
   ! { "prefix !" }
   - { "prefix -" }

test/setter/associativity.wren

@@ -1,7 +1,7 @@
 class Foo {
   new(value) { _value = value }
   toString { _value }
-  bar = value {
+  bar=(value) {
     _value = value
     return value
   }

test/setter/grouping.wren

@@ -1,5 +1,5 @@
 class Foo {
-  bar = value { value }
+  bar=(value) { value }
 }
 
 var foo = new Foo

test/setter/infix_operator.wren

@@ -1,5 +1,5 @@
 class Foo {
-  bar = value { value }
+  bar=(value) { value }
 }
 
 var foo = new Foo

test/setter/instance.wren

@@ -1,5 +1,5 @@
 class Foo {
-  bar = value {
+  bar=(value) {
     IO.print(value)
   }
 }

test/setter/is.wren

@@ -1,5 +1,5 @@
 class Foo {
-  bar = value { value }
+  bar=(value) { value }
 }
 
 var foo = new Foo

test/setter/prefix_operator.wren

@@ -1,5 +1,5 @@
 class Foo {
-  bar = value { value }
+  bar=(value) { value }
 }
 
 var foo = new Foo

test/setter/result.wren

@@ -1,5 +1,5 @@
 class Foo {
-  bar = value { "result" }
+  bar=(value) { "result" }
 }
 
 var foo = new Foo

test/setter/same_name_as_method.wren

@@ -1,5 +1,5 @@
 class Foo {
-  bar = value { IO.print("set") }
+  bar=(value) { IO.print("set") }
   bar { IO.print("get") }
 }
 

test/setter/static.wren

@@ -1,5 +1,5 @@
 class Foo {
-  static bar = value {
+  static bar=(value) {
     IO.print(value)
   }
 }