fix: preserve live tasks during daemon recovery

tests/unit/admin_console/test_server_lifecycle.py

@@ -15,6 +15,7 @@
 import asyncio
 from contextlib import suppress
 import signal
+import socket
 from unittest.mock import AsyncMock, MagicMock, patch
 
 import pytest
@@ -23,10 +24,55 @@ import uvicorn
 from apps.admin_console.core.state import state
 from apps.admin_console.routers.tasks import stream_events
 from apps.admin_console.server import ArtemisUvicornServer, app, on_shutdown
+from apps.admin_console import server as server_module
 
 WINDOWS_FORCE_SIGNAL = getattr(signal, "SIGBREAK", signal.SIGTERM)
 
 
+@pytest.mark.parametrize("reload", [False, True])
+def test_occupied_port_never_initializes_or_overwrites_server_metadata(
+    tmp_path, monkeypatch, reload
+):
+    from artemis.runtime import server_lifecycle
+
+    metadata = tmp_path / "server.json"
+    metadata.write_text('{"pid":123,"lifecycle_token":"original"}', encoding="utf-8")
+    monkeypatch.setattr(server_lifecycle, "get_server_info_file", lambda: metadata)
+    before = metadata.read_bytes()
+    with (
+        socket.create_server(("127.0.0.1", 0)) as original,
+        patch.object(server_module.ArtemisUvicornServer, "run") as run,
+        patch.object(server_module, "write_server_info") as publish,
+    ):
+        with pytest.raises(SystemExit, match="1"):
+            server_module.run_ui_server("127.0.0.1", original.getsockname()[1], reload=reload)
+        run.assert_not_called()
+        publish.assert_not_called()
+        assert metadata.read_bytes() == before
+
+
+def test_server_holds_port_before_running_lifespan(monkeypatch):
+    monkeypatch.setattr(state, "port", 0, raising=False)
+    monkeypatch.setattr(state, "host", "127.0.0.1", raising=False)
+    observed = []
+
+    def run(_server, sockets):
+        listener = sockets[0]
+        port = listener.getsockname()[1]
+        observed.append(listener)
+        assert state.port == port
+        with pytest.raises(OSError), socket.create_server(("127.0.0.1", port)):
+            pass
+
+    monkeypatch.setattr(server_module.ArtemisUvicornServer, "run", run)
+    monkeypatch.setattr(server_module, "clear_server_info", lambda **kwargs: None)
+    with patch.object(server_module, "write_server_info") as publish:
+        server_module.run_ui_server("127.0.0.1", 0)
+        publish.assert_not_called()  # Publication belongs to the later lifespan.
+    assert len(observed) == 1
+    assert observed[0].fileno() == -1
+
+
 def _pending_queue_get_tasks():
     return {
         task