src: add dump_simulation_state test utility

Helper function to print spacecraft orbits, positions, velocities,
and maneuver details for debugging integration tests.

src/test_utilities.cpp

@@ -1,6 +1,7 @@
 #include "test_utilities.h"
 #include <cstdlib>
 #include <cmath>
+#include <cstdio>
 
 double calculate_kinetic_energy(CelestialBody* body) {
     double v_squared = body->global_velocity.x * body->global_velocity.x +
@@ -164,3 +165,38 @@ bool compare_vec3(Vec3 a, Vec3 b, double tolerance) {
            fabs(a.y - b.y) <= tolerance &&
            fabs(a.z - b.z) <= tolerance;
 }
+
+void dump_simulation_state(SimulationState* sim, const char* label) {
+    printf("\n=== %s (t=%.0f s) ===\n", label, sim->time);
+
+    printf("Bodies (%d):\n", sim->body_count);
+    for (int i = 0; i < sim->body_count; i++) {
+        printf("  [%d] %s: mass=%.2e kg\n",
+               i, sim->bodies[i].name, sim->bodies[i].mass);
+    }
+
+    printf("Spacecraft (%d):\n", sim->craft_count);
+    for (int i = 0; i < sim->craft_count; i++) {
+        Spacecraft* s = &sim->spacecraft[i];
+        double r = sqrt(s->local_position.x*s->local_position.x +
+                       s->local_position.y*s->local_position.y +
+                       s->local_position.z*s->local_position.z);
+        double v = sqrt(s->local_velocity.x*s->local_velocity.x +
+                       s->local_velocity.y*s->local_velocity.y +
+                       s->local_velocity.z*s->local_velocity.z);
+        printf("  [%d] %s: r=%.1f v=%.1f nu=%.5f a=%.1f e=%.6f\n",
+               i, s->name, r, v,
+               s->orbit.true_anomaly, s->orbit.semi_major_axis, s->orbit.eccentricity);
+        printf("       pos=(%.1f, %.1f, %.1f) vel=(%.1f, %.1f, %.1f)\n",
+               s->local_position.x, s->local_position.y, s->local_position.z,
+               s->local_velocity.x, s->local_velocity.y, s->local_velocity.z);
+    }
+
+    printf("Maneuvers (%d):\n", sim->maneuver_count);
+    for (int i = 0; i < sim->maneuver_count; i++) {
+        Maneuver* m = &sim->maneuvers[i];
+        printf("  [%d] %s: craft=%d dir=%d dv=%.4f trigger=%d val=%.2f exec=%d\n",
+               i, m->name, m->craft_index, m->direction, m->delta_v,
+               m->trigger_type, m->trigger_value, m->executed);
+    }
+}

src/test_utilities.h

@@ -46,4 +46,7 @@ void destroy_orbit_tracker(OrbitTracker* tracker);
 bool compare_double(double a, double b, double tolerance);
 bool compare_vec3(Vec3 a, Vec3 b, double tolerance);
 
+// Debug helper: dump simulation state to console
+void dump_simulation_state(SimulationState* sim, const char* label);
+
 #endif