Improve physical geometry, fluid solvers, audio, and profiling

include/FluidSim/EngineConfig.hpp

@@ -1,9 +1,12 @@
 #pragma once
+#include "FluidSim/MeshResolution.hpp"
 #include "FluidSim/Engine.hpp"
 #include "FluidSim/Ecu.hpp"
 #include "FluidSim/Vehicle.hpp"
 #include "FluidSim/Carburetor.hpp"
+#include "FluidSim/PhysicalGeometry.hpp"
 #include <string>
+#include <array>
 #include <vector>
 
 namespace fluidsim::port {
@@ -17,11 +20,14 @@ struct PipeConfig {
     float diameter{}, length{}; // metres
     int cells{}, count{1};
     bool silenced{};
+    bool operator==(const PipeConfig&) const = default;
 };
 
 // Parsed calibration only. Runtime state belongs to the scenario components.
 // Dimensional fields use SI units after loading.
 struct EngineConfig {
+    PhysicalGeometry geometry;
+    float cells_per_meter{}; // Zero retains legacy programmatic meshes. TOML scenarios specify a density.
     int cylinders{};
     EngineLayout layout{EngineLayout::Inline};
     ExhaustTopology topology{ExhaustTopology::Collector};
@@ -31,6 +37,9 @@ struct EngineConfig {
     EcuConfig ecu;
     VehicleConfig vehicle;
     CarburetorConfig fuel;
+    FourStrokeCylinder::CamProfile intake_cam,exhaust_cam;
+    FourStrokeCylinder::ValveDynamics intake_valve,exhaust_valve;
+    struct ValveSound { float mode_hz{3600}, effective_mass_kg{0.18f}, radiation_area{0.001f}, damping_ratio{0.9f}; } valve_sound;
     bool carbureted{}, initialize_phased_charge{true};
     float initial_rpm{}, starter_torque{}, maximum_load_torque{};
     float plenum_volume{}, collector_volume{}, throttle_diameter{}, pipe_damping{};
@@ -45,7 +54,14 @@ struct EngineConfig {
     int header_groups() const { return cylinders==3?1:2; }
 };
 
+struct JunctionBranchConfig {
+    int pipe{}; bool left{};
+    std::array<float,3> direction{};
+};
 struct JunctionConfig {
+    std::string model{"volume"}; // volume, characteristic, or legacy
+    float turning_loss{0};
+    std::vector<JunctionBranchConfig> branches;
     bool h_pipe{true};
     float junction_volume{50e-6f};
 };