Replace Python numerical kernels with native C execution

app/system_xml.py

@@ -12,8 +12,8 @@ from lxml import etree
 from app.simulation.core.ports import PortDefinition
 from app.simulation.performance import profile_phase
 from app.simulation.registry import COMPONENT_MODEL_REGISTRY, ParameterSpec
-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_sample_times,
 )
@@ -25,7 +25,7 @@ SYSTEM_XML_MAX_BYTES = 5 * 1024 * 1024
 SYSTEM_XML_V3_SCHEMA_PATH = (
     Path(__file__).resolve().parent.parent / "schemas" / "system-simulation-v3.xsd"
 )
-SUPPORTED_SOLVER_METHODS = {"RK45", "RK23", "DOP853", "Radau", "BDF", "LSODA"}
+SUPPORTED_SOLVER_METHODS = {"RK45", "BDF"}
 
 
 @dataclass(frozen=True)