fix: suppress stale "Still working..." heartbeats during gateway restart

The gateway's long-running notification task was sending "Still working...
messages even after a restart was requested, causing confusing UX where
users received a restart warning followed by normal heartbeat messages.

Added a check in _notify_long_running() to skip notifications when
gateway is draining or restart has been requested.

Fixes NousResearch/hermes-agent#10990

gateway/run_shutdown.py

@@ -1077,6 +1077,10 @@ class GatewayShutdownMixin:
         """
         if agent is None or (executor_task is not None and executor_task.done()):
             return False
+        # Drain/restart already told the chat the task will be interrupted; a "still working"
+        # heartbeat after that notice reads as a contradiction (#10990).
+        if getattr(self, "_draining", False) or getattr(self, "_restart_requested", False):
+            return False
         if session_key:
             _hb_state = self._peek_session_state(session_key)
             if (_hb_state.turn.agent if _hb_state else None) is not agent:

tests/gateway/test_busy_session_ack.py

@@ -518,4 +518,17 @@ class TestLongRunningNotificationOwnership:
             "sess", original_agent, executor_task=None
         ) is False
 
+    @pytest.mark.parametrize("flag", ["_draining", "_restart_requested"])
+    def test_notification_stops_once_shutdown_or_restart_begins(self, flag):
+        """After the restart/shutdown notice a heartbeat would contradict it (#10990)."""
+        from gateway.run import GatewayRunner
+
+        runner = object.__new__(GatewayRunner)
+        runner._running_agents = {}
+        agent = MagicMock()
+        runner._running_agents["sess"] = agent
+        assert runner._should_emit_long_running_notification("sess", agent, executor_task=None) is True
+        setattr(runner, flag, True)
+        assert runner._should_emit_long_running_notification("sess", agent, executor_task=None) is False
+