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

simulation/sim_base.py

@@ -23,6 +23,7 @@ class BaseSimulation:
   print("\n[BaseSim] Connecting to GUI...")
   if not self.client.wait_for_server(timeout=5):
    raise RuntimeError("Could not connect to GUI. Ensure it is running with --enable-test-hooks")
+  self.client.clear_events()
   self.client.set_value("auto_add_history", True)
   # Wait for propagation
   _start = time.time()