feat: add global device queue and readiness tracking

tests/unit/runtime/test_supervisor.py

@@ -0,0 +1,27 @@
+from unittest.mock import MagicMock, patch
+
+from artemis.runtime.supervisor import ProcessSupervisor
+
+
+def test_verified_termination_rejects_reused_pid():
+    process = MagicMock()
+    process.create_time.return_value = 200.0
+    with (
+        patch("psutil.Process", return_value=process),
+        patch.object(ProcessSupervisor, "terminate_tree") as terminate_tree,
+    ):
+        assert ProcessSupervisor.terminate_tree_verified(1234, 100.0) is False
+
+    terminate_tree.assert_not_called()
+
+
+def test_verified_termination_stops_matching_process_tree():
+    process = MagicMock()
+    process.create_time.return_value = 100.0
+    with (
+        patch("psutil.Process", return_value=process),
+        patch.object(ProcessSupervisor, "terminate_tree", return_value=True) as terminate_tree,
+    ):
+        assert ProcessSupervisor.terminate_tree_verified(1234, 100.0) is True
+
+    terminate_tree.assert_called_once_with(1234, timeout_seconds=3.0)