Complete weak reference auto-nil system implementation

Co-authored-by: moe-charm <217100418+moe-charm@users.noreply.github.com>

src/interpreter/mod.rs

@@ -41,6 +41,7 @@ mod web_methods;
 mod special_methods;
 
 // Main interpreter implementation - will be moved from interpreter.rs
+pub use core::NyashInterpreter;
 
 
 /// 実行制御フロー