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/bot_controller.gd

@@ -210,9 +210,9 @@ func _run_ai_tick():
 			print("[BotController] Action Taken: Attack Pursuit")
 			return
 			
-	# Priority 0.5: Gauntlet (#075) — burn Cleanser if boxed in
-	if await _try_activate_cleanser():
-		print("[BotController] Action Taken: Cleanser (trapped)")
+	# Priority 0.5: Gauntlet (#075) — use Ghost powerup if boxed in
+	if await _try_activate_ghost():
+		print("[BotController] Action Taken: Ghost (trapped)")
 		return
 
 	# Priority 1: Tekton Management (Grab Tekton if full boost, or spawn if carrying)
@@ -260,27 +260,24 @@ func _run_ai_tick():
 			return
 
 # =============================================================================
-# Gauntlet (#075) — Cleanser + Sticky Avoidance wiring
+# Gauntlet (#075) — Ghost Powerup + Sticky Avoidance wiring
 # =============================================================================
 
-func _try_activate_cleanser() -> bool:
-	"""Activate Cleanser when the planner reports imminent danger.
+func _try_activate_ghost() -> bool:
+	"""Activate Ghost powerup when the planner reports imminent danger.
 
-	Server-authoritative RPC; we only request it. Returns true if the request
-	was sent successfully (not a guarantee it landed on a sticky cell)."""
+	Uses the existing SpecialTilesManager to activate the held ghost powerup.
+	Returns true if activation was triggered."""
 	if not strategic_planner or not strategic_planner.is_gauntlet_mode():
 		return false
-	if not strategic_planner.should_activate_cleanser_now():
+	if not strategic_planner.should_activate_ghost_now():
 		return false
-	var gm = strategic_planner._get_gauntlet_manager()
-	if not gm:
+	var stm = actor.get_node_or_null("SpecialTilesManager")
+	if not stm:
 		return false
-	var pid = actor.get("peer_id") if "peer_id" in actor else actor.name.to_int()
-	if pid == null or pid < 0:
-		return false
-	if gm.has_method("rpc_activate_cleanser"):
-		gm.rpc_activate_cleanser(pid)
-		print("[BotController] %s requested Cleanser activation (trapped)" % actor.name)
+	if stm.has_method("activate_effect"):
+		stm.activate_effect(stm.SpecialEffect.INVISIBLE_MODE)
+		print("[BotController] %s activated Ghost powerup (trapped)" % actor.name)
 		return true
 	return false
 
@@ -292,14 +289,14 @@ func _on_step_onto_unsafe() -> bool:
 	var here = actor.current_position if "current_position" in actor else Vector2i(-1, -1)
 	if here == Vector2i(-1, -1):
 		return false
-	# Post-move guard: if we somehow landed on a sticky without cleanser active,
-	# burn Cleanser to clear ourselves out next tick.
+	# Post-move guard: if we somehow landed on a sticky without ghost active,
+	# burn Ghost powerup to phase through next tick.
 	if strategic_planner.is_gauntlet_mode() and strategic_planner._is_overlay_unsafe(here):
-		if not strategic_planner._is_bot_cleanser_active():
+		if not strategic_planner._is_bot_ghost_active():
 			var gm = strategic_planner._get_gauntlet_manager()
 			if gm and gm.has_method("is_sticky_cell") and gm.is_sticky_cell(here):
-				print("[BotController] %s stepped onto sticky at %s — burning Cleanser" % [actor.name, here])
-				return _try_activate_cleanser()
+				print("[BotController] %s stepped onto sticky at %s — activating Ghost" % [actor.name, here])
+				return _try_activate_ghost()
 	return false
 
 # =============================================================================