Fix enum and struct styling in orbital_objects.h

- Convert typedef enum to C++ style enum
- Convert typedef struct to C++ style struct {}
- Add RendezvousState type to RendezvousTarget::state field
- Update comments to one-liners with inline descriptions
- Remove redundant struct names from comments

src/orbital_objects.h

@@ -11,52 +11,29 @@ struct SimulationState;
 // Rendezvous Types
 // ============================================================================
 
-/**
- * Rendezvous state machine
- *
- * States:
- * - NONE: No rendezvous active
- * - PLANNING: Target selected, approaching
- * - APPROACHING: Closing in on target
- * - MATCHING: Velocity matching phase
- * - COMPLETE: Rendezvous successful
- * - FAILED: Rendezvous failed
- */
-typedef enum {
+enum RendezvousState {
     RENDEZVOUS_NONE,
     RENDEZVOUS_PLANNING,
     RENDEZVOUS_APPROACHING,
     RENDEZVOUS_MATCHING,
     RENDEZVOUS_COMPLETE,
     RENDEZVOUS_FAILED
-} RendezvousState;
-
-/**
- * Rendezvous target structure
- *
- * Tracks the active rendezvous target and state for a spacecraft
- */
-typedef struct {
+};
+
+struct RendezvousTarget {  // Active rendezvous target configuration
     int target_index;           // Index of target spacecraft/body
-    int state;                  // RendezvousState
+    RendezvousState state;      // Current rendezvous state
     double approach_distance;   // Distance to start approach phase (m)
     double capture_distance;    // Distance for capture (m)
     double max_relative_velocity; // Max closing speed for capture (m/s)
     double cw_linearization_time; // Last time CW equations were linearized (s)
     bool is_spacecraft_target;  // True if target is spacecraft, false if body
-} RendezvousTarget;
+};
 
 // ============================================================================
 // Celestial Body Structure
 
-/**
- * Celestial Body Structure
- *
- * Represents a planet, star, moon, or other gravitational body
- * in the simulation. Supports hierarchical orbital mechanics with
- * parent-child relationships and sphere of influence calculations.
- */
-struct CelestialBody {
+struct CelestialBody {  // Gravitational body in the simulation
     char name[64];
     double mass;              // kg
     double radius;            // meters
@@ -77,13 +54,7 @@ struct CelestialBody {
     double soi_radius;        // sphere of influence radius (meters)
 };
 
-/**
- * Spacecraft Structure
- *
- * Represents a spacecraft or probe in the simulation.
- * Supports orbital mechanics, maneuvers, and rendezvous operations.
- */
-struct Spacecraft {
+struct Spacecraft {  // Spacecraft or probe in the simulation
     char name[64];
     double mass;
     int parent_index;