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Coupled Vector Engines - Rigid Body Physics Simulation

This demonstrates a proper 2D rigid body physics system where multiple engines are coupled together to form a single ship. Key physics concepts:

CENTER OF MASS (COM): The true pivot point calculated from all masses
MOMENT OF INERTIA: Resistance to rotation based on mass distribution
TORQUE: Rotational force = distance × force (cross product)
GRAVITY-GRADIENT TORQUE: Instability from mass distribution in gravity field

Physics Improvements (v2): - Fixed: Ship now rotates around actual COM, not reference point - Fixed: Gravity strength consistent between linear and rotational - Fixed: Multiple COM calculations optimized to single calculation per frame - Added: getTotalMass() helper to avoid repeated calculations - Cleaned: Removed unused helper functions and variables

Physics Improvements (v3): - Refactored: Extracted calculateMomentOfInertia() as standalone function - Documented: Complete API reference in docs/moment-of-inertia-api.md - Educational: Added beginner's guide in docs/moment-of-inertia-explained.md - Simplified: Unified body list API - all bodies treated equally, distinguished by isLocal flag - Extracted: calculateTotalMass(), calculateCenterOfMass(), applyEngineForces(), applyGravityGradientTorque(), applyGamepadControls(), and updateRigidBodyPhysics() as reusable standalone functions

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