Jumpbug: automatic duck+jump on damaging falls

- Predict the landing speed from the current vertical velocity and a swept
  standing-hull ground trace; engage only when it exceeds
  PLAYER_MAX_SAFE_FALL_SPEED.
- Press duck one command before the unduck window so FinishDuck's 36-unit
  origin raise places the feet ~37 units above the floor.
- On the next command release duck and press jump: PlayerMove runs Duck()
  before CheckJumpButton, so FinishUnDuck sets ground, the jump executes, and
  CheckFalling never sees ground for the fall-damage check.
- Measure the per-command fall from consecutive airborne origins instead of a
  fixed tick interval; clear IN_JUMP while waiting so the pogo latch is clear.
- New Movement -> Jumpbug -> Active toggle (default on), config [jumpbug].

0 files changed, 0 insertions, 0 deletions