feat: overhaul movement for flow — momentum-preserving states, smooth crouch, landing feel

- Quake-style air-strafe accelerate (real speed gain from strafing; external
  speed from dash/rockets never clamped)
- Wall run: keeps entry momentum (incl. upward carry), accelerates along the
  wall instead of hard-setting velocity, gravity fades in over the run
- Slide: slope physics (gravity projected along floor accelerates downhill),
  flat-ground decel instead of multiplicative friction, entry boost, direct
  slide->wallrun and slide->dash transitions
- Dash: cooldown 10s -> 2s, per-player (was a static shared across instances),
  momentum fully kept on exit, FOV punch event
- Grapple: taut pendulum with active rope control (W reels in, S pays out),
  release keeps swing energy
- Wall climb: carries upward momentum in, jump-off kick, shared vault helper
- Crouch capsule: single owner in the machine, smoothly lerped, ceiling check;
  camera eye height follows via crouch factor (no more head snapping)
- Landing: machine emits 'land' events scaled by impact; camera dip + pitched
  down thud; footsteps get pitch variation
- Camera rig: event-driven (land dip, dash FOV kick, vault pitch impulse),
  slide roll tilt
- Model: Jump vs Fall split by vertical velocity, Land one-shot on heavy
  landings, wall-run body lean (synced to remotes via synced_wall_side)

Co-Authored-By: Claude Fable 5 <[email protected]>

movement/states/state_dash.gd

@@ -1,28 +1,22 @@
 extends Node
 class_name StateDash
 
+## Short burst dash. Cooldown lives on the machine (per-player instance) and is
+## checked by the states that enter dash, so entering this state always dashes.
+## Momentum is fully preserved on exit — the dash ADDS speed to your run.
+
 var machine: MovementStateMachine
 var params: MovementParams:
 	get: return machine.params
 
 var elapsed: float = 0.0
 var direction: Vector3 = Vector3.ZERO
-var _exit_speed: float = 0.0
-var _last_vel: Vector3 = Vector3.ZERO
-
-# Cooldown tracked across dash instances
-static var _last_dash_time: float = -999.0
+var _dash_speed: float = 0.0
 
 
 func enter(_data: Dictionary = {}) -> void:
-	# Check cooldown
-	var now := Time.get_ticks_msec() / 1000.0
-	if now - _last_dash_time < params.dash_cooldown:
-		machine.switch_to("air")
-		return
-
 	elapsed = 0.0
-	_last_dash_time = now
+	machine.dash_cooldown_timer = params.dash_cooldown
 
 	var player := machine.player
 	if player.dash_player:
@@ -38,55 +32,49 @@ func enter(_data: Dictionary = {}) -> void:
 		direction = direction.normalized()
 
 	machine.register_chain_mechanic("dash")
-	
+	machine.movement_event.emit("dash", {})
+
 	var current_hvel := Vector3(machine.player.velocity.x, 0.0, machine.player.velocity.z)
 	var current_speed := current_hvel.length()
 	var proj := current_hvel.dot(direction)
-	
+
 	var base_dash_speed = machine.get_effective_speed(params.dash_speed)
-	
+
 	if proj >= 0.0:
 		# Dashing forward or diagonally forward: add base dash speed to the projected speed
-		_exit_speed = proj + base_dash_speed
+		_dash_speed = proj + base_dash_speed
 	else:
 		# Dashing backward or diagonally backward:
-		# Reflect current momentum into the new direction, smoothly scaling from base_dash_speed (at sideways) to current_speed (at exactly backward).
+		# Reflect current momentum into the new direction, smoothly scaling from
+		# base_dash_speed (at sideways) to current_speed (at exactly backward).
 		var backward_factor = -proj / current_speed if current_speed > 0.001 else 0.0
-		_exit_speed = lerpf(base_dash_speed, maxf(current_speed, base_dash_speed), backward_factor)
-		
-	machine.player.velocity = direction * _exit_speed
+		_dash_speed = lerpf(base_dash_speed, maxf(current_speed, base_dash_speed), backward_factor)
+
+	machine.player.velocity = direction * _dash_speed
 	machine.on_ground = false
-	_last_vel = machine.player.velocity
 
 
 func exit() -> void:
-	# Preserve dash velocity on exit (don't cut speed abruptly)
 	pass
 
 
 func update(delta: float) -> void:
 	elapsed += delta
+	var player := machine.player
+
 	if elapsed > params.dash_duration:
-		machine.player.velocity = direction * _exit_speed * 0.85
-		if machine.player.is_on_floor():
+		# Keep the full dash velocity — the dash is a speed investment
+		player.velocity = direction * _dash_speed
+		if player.is_on_floor():
 			machine.on_ground = true
 			machine.switch_to("ground")
 		else:
 			machine.switch_to("air")
 		return
 
-	# Maintain dash velocity
-	var player := machine.player
-	var vel: Vector3 = player.velocity
-	
-	if vel.distance_squared_to(_last_vel) > 100.0:
-		machine.switch_to("air")
-		return
-	
-	vel = direction * _exit_speed
+	# Maintain dash velocity, flat trajectory
+	var vel := direction * _dash_speed
 	if player.is_on_floor():
 		vel.y = -0.5 # Snap to floor to handle ramps
-		
 	player.velocity = vel
 	player.move_and_slide()
-	_last_vel = player.velocity