fix(host-agent): advertise connected devices

apps/device-host-agent/tests/test_heartbeat.py

@@ -9,6 +9,11 @@ from host_agent.config import HostAgentConfig
 from host_agent.heartbeat import HeartbeatSynchronizer, build_device_snapshot
 
 
+class ConnectableDriver:
+    def connect(self) -> None:
+        return None
+
+
 def _config() -> HostAgentConfig:
     return HostAgentConfig(
         control_plane_url="https://control.example",
@@ -38,7 +43,7 @@ def test_build_device_snapshot_copies_complete_non_secret_state() -> None:
 
     assert [device.device_id for device in snapshot] == ["device-a", "device-b"]
     assert snapshot[1].driver_type == "appium"
-    assert snapshot[1].status == "busy"
+    assert snapshot[1].status == "idle"
     assert snapshot[1].capability_tags == ["android", "physical"]
     assert "must-not-leave-host" not in repr(snapshot)
 
@@ -47,7 +52,7 @@ def test_heartbeat_synchronizer_runs_at_configured_interval_until_stopped() -> N
     manager = DeviceManager()
     manager.register_device(
         "device-a",
-        lambda: object(),  # type: ignore[arg-type,return-value]
+        lambda: ConnectableDriver(),  # type: ignore[arg-type,return-value]
     )
     calls: list[list[str]] = []
 
@@ -75,3 +80,4 @@ def test_heartbeat_synchronizer_runs_at_configured_interval_until_stopped() -> N
 
     asyncio.run(scenario())
     assert calls == [["device-a"], ["device-a"], ["device-a"]]
+    assert manager.status("device-a") == "busy"