feat: Introduce compiler header with parsing rules and implement initial bytecode generation for expressions.

Author: ProgrammerKR

include/compiler.h

@@ -38,7 +38,7 @@ typedef struct {
 ObjFunction* compile(const char *source);
 
 #include "ast.h"
-void generateBytecode(StmtList* statements, Chunk* chunk);
+bool generateBytecode(StmtList* statements, Chunk* chunk);
 
 void markCompilerRoots();
 

src/compiler/bytecode_gen.c

@@ -43,7 +43,8 @@ typedef struct Compiler {
 
 typedef struct {
     Compiler* compiler;
-    Chunk* chunk; // Current chunk being written to (convenience)
+    Chunk* chunk; 
+    bool hadError;
 } BytecodeGen;
 
 // --- Forward Declarations ---