style: auto-format example files with lux fmt

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

examples/modules/string_utils.lux

@@ -1,11 +1,5 @@
-// String utilities module
-// Exports: repeat, exclaim
+fn repeat(s: String, n: Int): String = if n <= 0 then "" else s + repeat(s, n - 1)
 
-pub fn repeat(s: String, n: Int): String =
-    if n <= 0 then ""
-    else s + repeat(s, n - 1)
+fn exclaim(s: String): String = s + "!"
 
-pub fn exclaim(s: String): String = s + "!"
-
-pub fn greet(name: String): String =
-    "Hello, " + name + "!"
+fn greet(name: String): String = "Hello, " + name + "!"