Replace Python numerical kernels with native C execution

tests/test_amesim_gas_registry.py

@@ -155,7 +155,6 @@ class AmesimGasRegistryTests(unittest.TestCase):
         self.assertEqual(medium.PROPERTY_METHOD_ID, "ideal_gas")
         self.assertEqual(medium.R_gas, 287.0)
         self.assertEqual(medium.cp_ref, 1005.0)
-        self.assertEqual(medium.cv, 718.0)
 
     def test_gi_normalization_rejects_fractional_and_out_of_range_values(self) -> None:
         self.assertEqual(normalize_amesim_gas_index(0.0), 0)
@@ -369,7 +368,7 @@ class AmesimGasRegistryTests(unittest.TestCase):
         with self.assertRaisesRegex(ValueError, "gi.*at least 1"):
             compile_reactflow_network(project)
 
-    def test_default_compile_uses_air_before_state_initialization(self) -> None:
+    def test_default_compile_selects_air_without_python_state(self) -> None:
         project = ReactFlowProjectPayload(
             projectSchemaVersion=1,
             name="default-air",
@@ -380,12 +379,9 @@ class AmesimGasRegistryTests(unittest.TestCase):
         chamber = network.components["chamber_1"]
 
         self.assertEqual(chamber.medium.name, "AMESimAirIdealGas")
-        self.assertAlmostEqual(
-            chamber.state.m,
-            chamber.medium.density(200000.0, 300.0) * 0.01,
-        )
+        self.assertFalse(hasattr(chamber, "state"))
 
-    def test_gi_is_resolved_before_dynamic_state_initialization(self) -> None:
+    def test_gi_is_resolved_before_native_compilation(self) -> None:
         registry, _, future_helium = two_slot_registry()
         project = ReactFlowProjectPayload(
             projectSchemaVersion=1,
@@ -400,14 +396,6 @@ class AmesimGasRegistryTests(unittest.TestCase):
         chamber = network.components["chamber_1"]
 
         self.assertIs(chamber.medium, future_helium)
-        self.assertAlmostEqual(
-            chamber.state.m,
-            future_helium.density(200000.0, 300.0) * 0.01,
-        )
-        self.assertNotAlmostEqual(
-            chamber.state.m,
-            IdealGasMedium().density(200000.0, 300.0) * 0.01,
-        )
 
     def test_selected_medium_is_injected_into_the_whole_pneumatic_circuit(
         self,