feat: for-of 异常中断按规范关闭迭代器，next() 抛错可捕获并保留原始值

crates/oxide_vm/src/vm_runtime.rs

@@ -176,6 +176,8 @@ impl Vm {
                     self.restore_frame(frame);
                 }
             }
+            // IteratorClose any for-of loops abandoned inside this handler's scope.
+            self.close_for_of_above(handler.for_of_depth);
             if let Some(finally_pc) = handler.finally_pc {
                 vm_trace!("unwind: entering finally at pc={}", finally_pc);
                 if self.pending_exception.is_none() {
@@ -193,10 +195,14 @@ impl Vm {
                 return Ok(());
             }
         }
+        self.close_for_of_above(0);
         while let Some(frame) = self.frames.pop() {
             self.restore_frame(frame);
         }
         let exc = self.exception_value.take().unwrap_or(JsValue::undefined());
+        // Preserve the escaping JsValue so a for-of next()-throw can re-throw the original
+        // value instead of the flattened string (consumed by dispatch_for_of_done/next).
+        self.last_uncaught_value = Some(exc);
         let kind_str = self.pending_error_kind.take().unwrap_or("Error");
         let exc_text = self.error_text(exc);
         let msg = if exc_text.starts_with(kind_str) {