feat: extend stall timeout and remove sample cap

tests/test_generic_system_xml_simulation.py

@@ -475,6 +475,20 @@ class GenericSystemXmlSimulationTests(unittest.TestCase):
             "port_a",
         )
 
+    def test_raw_system_xml_serializes_more_than_legacy_sample_limit(self) -> None:
+        project = chain_project()
+        project.simulation.step = 0.0000005
+        xml = build_reactflow_system_xml(project)
+
+        response = asyncio.run(simulate_system_xml(xml_request(xml)))
+        round_tripped = json.loads(json.dumps(response))
+
+        self.assertTrue(round_tripped["success"])
+        self.assertEqual(round_tripped["diagnostics"]["sampleCount"], 20001)
+        self.assertEqual(len(round_tripped["series"]["time"]), 20001)
+        self.assertEqual(round_tripped["series"]["time"][0], 0.0)
+        self.assertEqual(round_tripped["series"]["time"][-1], 0.01)
+
     def test_streaming_endpoint_events_have_monotonic_progress_and_result(self) -> None:
         project = chain_project()
         xml = build_reactflow_system_xml(project)