test(audit): fix critical test suite deadlocks and write exhaustive architectural report

- Fix 'Triple Bingo' history synchronization explosion during streaming

- Implement stateless event buffering in ApiHookClient to prevent dropped events

- Ensure 'tool_execution' events emit consistently across all LLM providers

- Add hard timeouts to all background thread wait() conditions

- Add thorough teardown cleanup to conftest.py's reset_ai_client fixture

- Write highly detailed report_gemini.md exposing asyncio lifecycle flaws

src/events.py

@@ -38,6 +38,10 @@ class EventEmitter:
    for callback in self._listeners[event_name]:
     callback(*args, **kwargs)
 
+ def clear(self) -> None:
+  """Clears all registered listeners."""
+  self._listeners.clear()
+
 class AsyncEventQueue:
  """
     Asynchronous event queue for decoupled communication using asyncio.Queue.
@@ -66,6 +70,14 @@ class AsyncEventQueue:
         """
   return await self._queue.get()
 
+ def task_done(self) -> None:
+  """Signals that a formerly enqueued task is complete."""
+  self._queue.task_done()
+
+ async def join(self) -> None:
+  """Blocks until all items in the queue have been gotten and processed."""
+  await self._queue.join()
+
 class UserRequestEvent:
  """
     Payload for a user request event.