Extract large update_simulation function into focused helpers:
- update_bodies_physics() - Handle body RK4 and SOI transitions
- update_spacecraft_physics() - RK4 integration for spacecraft
- execute_pending_maneuvers() - Check triggers and execute burns
- compute_spacecraft_globals() - Global coords for spacecraft
Simplified update_simulation to call helpers sequentially:
1. Bodies physics
2. Bodies global coords
3. Spacecraft physics
4. Maneuver execution
5. Spacecraft global coords
6. Time step
Benefits:
- Single responsibility per function
- Cleaner, more readable code
- Easier to test individual components
- Net change: +96 lines (helper functions) -86 lines (removal)
All maneuver tests still passing.
cinnaboot