Replace Python numerical kernels with native C execution

tests/test_simulation_safety.py

@@ -9,10 +9,9 @@ from app.simulation.components.amesim.mechanical.translational import (
 )
 from app.simulation.components.amesim.signals.sources import AmesimStep0
 from app.simulation.core.medium import IdealGasMedium
-from app.simulation.solvers.solver import SolveIVPConfig
-from app.simulation.systems.generic import (
+from app.simulation.config import SolveIVPConfig
+from app.simulation.sampling import (
     SimulationSampleTimeError,
-    simulation_preparation_issues,
     simulation_sample_times,
 )
 from app.simulation.systems.network import SimulationNetwork
@@ -193,35 +192,17 @@ class SimulationSampleTimeSafetyTests(unittest.TestCase):
                 )
 
 
-class PhysicalIslandSafetyTests(unittest.TestCase):
-    def test_signal_fanout_does_not_hide_an_unanchored_physical_island(self) -> None:
-        issues = simulation_preparation_issues(
-            _fanout_mechanical_network(second_island_has_storage=False)
-        )
-        island_issues = [
-            issue
-            for issue in issues
-            if issue.code == "ALGEBRAIC_ISLAND_HAS_NO_STORAGE"
-        ]
-
-        self.assertEqual(len(island_issues), 1)
-        self.assertIn("force_b", island_issues[0].message)
-        self.assertIn("zero_b", island_issues[0].message)
-        self.assertNotIn("command", island_issues[0].message)
-        self.assertNotIn("mass_a", island_issues[0].message)
-
-    def test_signal_fanout_between_two_anchored_physical_islands_is_allowed(
-        self,
-    ) -> None:
-        issues = simulation_preparation_issues(
-            _fanout_mechanical_network(second_island_has_storage=True)
-        )
-
-        self.assertNotIn(
-            "ALGEBRAIC_ISLAND_HAS_NO_STORAGE",
-            {issue.code for issue in issues},
-        )
 
 
 if __name__ == "__main__":
     unittest.main()
+
+class NativePhysicalIslandSafetyTests(unittest.TestCase):
+    def test_unanchored_force_island_is_rejected(self):
+        from app.simulation.native_codegen.compiler import NativeCapabilityError, compile_native_program
+        with self.assertRaises(NativeCapabilityError):
+            compile_native_program(_fanout_mechanical_network(second_island_has_storage=False))
+
+    def test_two_anchored_islands_are_supported(self):
+        from app.simulation.native_codegen.compiler import compile_native_program
+        self.assertEqual(len(compile_native_program(_fanout_mechanical_network(second_island_has_storage=True)).state_keys), 4)