feat(gauntlet): replace Cleanser with Ghost powerup sticky bypass (v2.4.2)

- Remove entire Cleanser system (signal, vars, HUD, input, RPCs, bot AI)
- Ghost (Invisible Mode) now bypasses sticky tiles in Gauntlet
- Grant Ghost powerup every 2 missions instead of Cleanser charges
- Ghost tiles spawn naturally on Gauntlet arena (15% chance)
- Bots use Ghost powerup when boxed in by sticky tiles
- Players pushed into sticky while Ghost are not slowed
- Remove use_cleanser input action from project.godot
- Remove CleanserHBox UI from gauntlet_hud.tscn
- Bump version to 2.4.2

scripts/managers/player_movement_manager.gd

@@ -155,15 +155,12 @@ func simple_move_to(grid_position: Vector2i) -> bool:
 				player.knock_tekton()
 				return false # Don't move into the tile, just knock
 
-	# If moving into a sticky cell: slow the player (unless cleanser active,
-	# which clears the cell instead). Sticky no longer hard-traps.
+	# If moving into a sticky cell: block movement unless player is in ghost
+	# mode (is_invisible), which lets them bypass sticky tiles in gauntlet.
 	if gm and gm.is_active and gm.is_sticky_cell(grid_position):
-		var pid = player.get("peer_id") if "peer_id" in player else -1
-		if pid != -1 and gm.is_cleanser_active(pid):
-			# Cleanser immunity: clear sticky cell, use one cell, don't slow
-			gm.clear_sticky_cell(grid_position)
-			gm.use_cleanser_cell(pid)
-			print("[Move] Cleanser cleared sticky cell at %s (%d cells left)" % [grid_position, gm.cleanser_cells_left.get(pid, 0)])
+		if player.get("is_invisible"):
+			# Ghost mode: walk through sticky tile freely
+			print("[Move] Ghost mode bypassed sticky cell at %s" % grid_position)
 		else:
 			print("[Move] Failed: Blocked by Gauntlet Sticky cell at %s" % grid_position)
 			return false
@@ -341,12 +338,9 @@ func try_push(target_pos: Vector2i, direction: Vector2i) -> bool:
 		if main_sticky and main_sticky.get("gauntlet_manager"):
 			var gm_sticky = main_sticky.gauntlet_manager
 			if gm_sticky.is_active and gm_sticky.is_sticky_cell(pushed_to_pos):
-				var push_pid = other_player.get("peer_id") if "peer_id" in other_player else -1
-				if push_pid != -1 and gm_sticky.is_cleanser_active(push_pid):
-					# Cleanser immunity: clear sticky cell, use one cell
-					gm_sticky.clear_sticky_cell(pushed_to_pos)
-					gm_sticky.use_cleanser_cell(push_pid)
-					print("[Move] Cleanser cleared push-into-sticky at %s" % pushed_to_pos)
+				if other_player.get("is_invisible"):
+					# Ghost mode: pushed player bypasses sticky
+					print("[Move] Ghost mode bypassed push-into-sticky at %s" % pushed_to_pos)
 				else:
 					print("[Move] Player pushed into sticky cell at %s — slowed" % pushed_to_pos)
 					if multiplayer.is_server() or other_player.is_multiplayer_authority():
@@ -406,17 +400,6 @@ func _on_movement_finished():
 			emit_signal("movement_finished")
 	else:
 		current_move_direction = Vector2i.ZERO
-		# Gauntlet (#072): a Cleanser ends early once the player rests on a safe
-		# cell. Gated on gm.is_active so other game modes are never affected.
-		var gm = null
-		var main_node = player.get_tree().root.get_node_or_null("Main")
-		if main_node and main_node.get("gauntlet_manager"):
-			gm = main_node.gauntlet_manager
-		if gm and gm.is_active and player.get("current_position") != null:
-			var mpid = player.get("peer_id") if "peer_id" in player else -1
-			if mpid != -1 and gm.is_cleanser_active(mpid):
-				if multiplayer.is_server() or player.is_multiplayer_authority():
-					gm.notify_movement_stopped(mpid, player.current_position)
 		emit_signal("movement_finished")
 
 func move_to_clicked_position(grid_position: Vector2i) -> bool: