feat: implement for-loops with proper scope management

- Add support for C-style for loops: for (init; condition; increment) { body }
- Implement three-level scoping: loop context + per-iteration contexts
- Add semicolon disabler for increment statements using RAII guards
- Support break/continue/return control flow with scope validation
- Fix semicolon handling in parser for flexible for-loop syntax

include/lexer.hpp

@@ -81,7 +81,6 @@ namespace Fig
         {
             return warnings;
         }
-
         Token nextToken();
 
         Token scanNumber();