Act as a Lead Gameplay Designer for a Virtual Reality project.

I want to propose expanding our combat system by adding the following core mechanics:

1. Melee Combat / Energy Blade (Lightsaber) mechanics with dynamic collision and slicing.
2. Contextual Takedowns (stealth, grapple, and finisher triggers).
3. Advanced Stance Controls (Crouch & Proning via head/rig tracking).

Please structure this into a clear feature proposal with the following sections:

• Detailed mechanics for each system (Lightsaber/Melee, Takedowns, Proning).
• How these mechanics interact with VR physics and motion controllers.

• Ergonomics and motion sickness prevention (especially for proning/takedown camera transitions).
• Haptic feedback implementation for blade parries and physical impacts.

• Key steps for setting up physics****boxes, IK (Inverse Kinematics) body tracking, and stance state management.
• Potential performance risks (e.g., dynamic mesh cutting, complex physics rigidbodies) and how to mitigate them.