Add turbocharged twin scenario and cross-platform test harness

include/FluidSim/TwoStrokeCylinder.hpp

@@ -1,6 +1,7 @@
 #pragma once
 
 #include "FluidSim/Crankcase.hpp"
+#include <cstdint>
 
 namespace fluidsim::port {
 
@@ -18,6 +19,9 @@ public:
     float exhaust_open() const { return 180.0f - exhaust_duration_ * 0.5f; }
     float exhaust_close() const { return 180.0f + exhaust_duration_ * 0.5f; }
     void set_crankcase(Crankcase& crankcase) { crankcase_ = &crankcase; }
+    float transfer_width{.050f}, exhaust_width{.036f};
+    float minimum_burn_seconds{.0008f};
+    std::uint64_t combustion_count() const { return combustion_count_; }
 
     float valve_area(float cycle_degrees, bool inlet) const override;
     void pre_step(Crankshaft& crank, float dt, float throttle) override;
@@ -26,7 +30,10 @@ private:
     float transfer_duration_{}, exhaust_duration_{};
     Crankcase* crankcase_{};
 
-    static float lift(float angle, float opens, float closes, float peak_lift);
+    float active_burn_duration_{60};
+    float current_rpm_{};
+    float active_spark_angle_{};
+    std::uint64_t combustion_count_{};
     void handle_cycle_events(float previous_degrees, float current_degrees);
 };