Implemented a responsive, deterministic jump system with "game feel" enhancements and advanced air physics.
Changes:
- **Jump Logic**: Added variable jump height (hold/release control).
- **Game Feel**: Implemented Coyote Time (jump after leaving ledge) and Jump Buffering (early input registration).
- **Air Physics**: Added non-linear gravity (FallingGravityScale) for snappy jumps and Terminal Velocity clamping.
- **Landing**: Added OnLanded delegate with heavy/light landing detection based on impact velocity.
- **Config**: Added auto-calculation logic in PostEditChangeProperty to derive Gravity and JumpVelocity from desired JumpHeight and TimeToApex.
- **Debug**: Added on-screen debug messages for Velocity Z and movement state.
- **Fix**: Moved delegate declaration to global scope to fix blueprint visibility issues.
Relates to: Phase 13, Phase 14
Nikolay Petrov