fix(test_gui2_parity): poll for set_value/click to propagate instead of time.sleep

The 'time.sleep + assert' pattern is a guaranteed race condition in batched
runs (per workflow's documented anti-pattern). In the live_gui batched test
suite, _process_pending_gui_tasks is competing for CPU with 16 xdist
workers, so 1.5s is sometimes not enough for a single set_value or click
to propagate through the gui task queue.

Fix: replace time.sleep(1.5) with a 10s poll loop that waits for the
expected state (per the same pattern used in test_gui2_custom_callback_hook_works
which was already fixed in commit 09eaf69a for the same reason).

This is a test-only fix; no production code changes.

tests/test_gui2_parity.py

@@ -42,20 +42,30 @@ def test_gui2_set_value_hook_works(live_gui: Any) -> None:
 
 def test_gui2_click_hook_works(live_gui: Any) -> None:
  """
- 
-  
-      Tests that the 'click' GUI hook for the 'Reset' button is implemented.
+ Tests that the 'click' GUI hook for the 'Reset' button is implemented.
  """
  client = ApiHookClient()
  assert client.wait_for_server(timeout=10)
  # First, set some state that 'Reset' would clear.
  test_value = "This text should be cleared by the reset button."
  client.set_value('ai_input', test_value)
- time.sleep(1.5)
+ # Poll for the set_value to propagate through the gui task queue
+ # (per workflow's race-condition anti-pattern guidance: time.sleep + assert
+ # is a guaranteed race in batched runs).
+ deadline = time.time() + 10.0
+ while time.time() < deadline:
+  if client.get_value('ai_input') == test_value:
+   break
+  time.sleep(0.1)
  assert client.get_value('ai_input') == test_value
  # Now, trigger the click
  client.click('btn_reset')
- time.sleep(1.5)
+ # Poll for the reset click to propagate (and verify the value clears).
+ deadline = time.time() + 10.0
+ while time.time() < deadline:
+  if client.get_value('ai_input') == "":
+   break
+  time.sleep(0.1)
  # Verify it was reset
  assert client.get_value('ai_input') == ""
 def test_gui2_custom_callback_hook_works(live_gui: Any) -> None: