[Spec] Point multi-layer eagle's last shared-read runner at the draft runner (#35057)

python/sglang/srt/speculative/multi_layer_eagle_worker_v2.py

@@ -955,6 +955,11 @@ class MultiLayerEagleWorkerV2(BaseSpecWorker):
 
         self.plan_stream, self.plan_stream_ctx = get_plan_stream(self.device)
 
+    @property
+    def last_shared_read_runner(self):
+        # Multi-layer eagle has no draft forward, only draft extend.
+        return self._draft_worker.draft_runner
+
     @property
     def spec_v2_attn_backends(self) -> tuple:
         return (