- Create items module with global_vars, functions, static_items
- Move parse_global_var from mod.rs to items/global_vars.rs
- Move parse_function_declaration to items/functions.rs
- Move parse_static_declaration and parse_static_function to items/static_items.rs
- Clean up mod.rs by removing 197 lines of code
- Build passes successfully
Next: Step 5 - Final cleanup and documentation
