[Core][Frontend] Bound duplex output delivery and reject cancelled audio (#7644)

Signed-off-by: Nolen Liang <nliang@nvidia.com>
Signed-off-by: bcsdhjew <nliang@nvidia.com>

tests/engine/duplex/test_aura_resumable_hooks.py

@@ -370,6 +370,7 @@ def test_draining_empty_eos_completes_owning_response_before_shortcut() -> None:
             stage_port=port,
             model_state=SimpleNamespace(clear_continuation=lambda: None),
             services=SimpleNamespace(spawn=lambda *_a, **_k: None),
+            run=SimpleNamespace(closing=False),
         ),
         out,
         close_from_runtime=_noop,
@@ -461,6 +462,7 @@ def test_draining_completion_drops_finished_response_books_only() -> None:
             stage_port=_Port(),
             model_state=SimpleNamespace(clear_continuation=lambda: None),
             services=SimpleNamespace(spawn=lambda *_a, **_k: None),
+            run=SimpleNamespace(closing=False),
         ),
         out,
         close_from_runtime=_noop,