fix: preserve live tasks during daemon recovery

tests/unit/runtime/test_daemon_client.py

@@ -93,6 +93,7 @@ def test_ensure_daemon_running_standalone_override(monkeypatch):
 def test_ensure_daemon_running_auto_spawns():
     with (
         patch("artemis.runtime.daemon_client.is_daemon_running", side_effect=[False, True]),
+        patch("artemis.runtime.daemon_client.is_port_in_use", return_value=False),
         patch("artemis.runtime.daemon_client.spawn_daemon") as mock_spawn,
     ):
         ok, base_url = ensure_daemon_running(timeout=1.0, wait_ready=True)
@@ -101,6 +102,42 @@ def test_ensure_daemon_running_auto_spawns():
         mock_spawn.assert_called_once()
 
 
+def test_busy_live_daemon_is_reused_without_spawning():
+    with (
+        patch("artemis.runtime.daemon_client.is_daemon_running", return_value=False),
+        patch("artemis.runtime.daemon_client.is_port_in_use", return_value=True),
+        patch(
+            "artemis.runtime.daemon_client.read_server_info",
+            return_value={"host": "127.0.0.1", "port": 8000, "pid": 12345},
+        ),
+        patch("artemis.runtime.daemon_client.pid_is_alive", return_value=True),
+        patch("artemis.runtime.daemon_client.spawn_daemon") as spawn,
+    ):
+        assert ensure_daemon_running() == (True, "http://127.0.0.1:8000")
+        spawn.assert_not_called()
+
+
+def test_unknown_port_owner_is_not_overwritten():
+    with (
+        patch("artemis.runtime.daemon_client.is_daemon_running", return_value=False),
+        patch("artemis.runtime.daemon_client.is_port_in_use", return_value=True),
+        patch("artemis.runtime.daemon_client.read_server_info", return_value=None),
+        patch("artemis.runtime.daemon_client.spawn_daemon") as spawn,
+    ):
+        assert ensure_daemon_running() == (False, None)
+        spawn.assert_not_called()
+
+
+def test_liveness_probe_uses_lightweight_endpoint_and_configured_timeout(monkeypatch):
+    from artemis.config.settings import settings
+
+    monkeypatch.setattr(settings, "ARTEMIS_DAEMON_PROBE_TIMEOUT_SECONDS", 7.0)
+    with patch("urllib.request.urlopen", return_value=_daemon_ok_response(b"{}")) as probe:
+        assert is_daemon_running()
+        assert probe.call_args.args[0].full_url.endswith("/api/system/server-status")
+        assert probe.call_args.kwargs["timeout"] == 7.0
+
+
 def test_submit_task_to_daemon():
     mock_resp = MagicMock()
     mock_resp.status = 200