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

src/lexer.cpp

@@ -76,6 +76,8 @@ namespace Fig
         {FString(u8"implement"), TokenType::Implement},
         {FString(u8"public"), TokenType::Public},
         {FString(u8"return"), TokenType::Return},
+        {FString(u8"break"), TokenType::Break},
+        {FString(u8"continue"), TokenType::Continue},
 
 
         // {FString(u8"Null"), TokenType::TypeNull},