Add subscription and event handling methods to LazyEventBus

This fixed code from not starting event bus listening loop

- Introduced `subscribe`, `unsubscribe`, `emit`, `start_listening`, and `stop_listening` methods to the _LazyEventBus class.
- Enhanced type hinting for better code clarity and usability.

Author: Dylan Huang

eval_protocol/event_bus/__init__.py

@@ -1,4 +1,5 @@
 # Global event bus instance - uses SqliteEventBus for cross-process functionality
+from typing import Any, Callable
 from eval_protocol.event_bus.event_bus import EventBus
 
 
@@ -18,8 +19,20 @@ def _get_event_bus(self):
             self._event_bus = _get_default_event_bus()
         return self._event_bus
 
-    def __getattr__(self, name):
-        return getattr(self._get_event_bus(), name)
+    def subscribe(self, callback: Callable[[str, Any], None]) -> None:
+        return self._get_event_bus().subscribe(callback)
+
+    def unsubscribe(self, callback: Callable[[str, Any], None]) -> None:
+        return self._get_event_bus().unsubscribe(callback)
+
+    def emit(self, event_type: str, data: Any) -> None:
+        return self._get_event_bus().emit(event_type, data)
+
+    def start_listening(self) -> None:
+        return self._get_event_bus().start_listening()
+
+    def stop_listening(self) -> None:
+        return self._get_event_bus().stop_listening()
 
 
 event_bus: EventBus = _LazyEventBus()