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_strategic_planner.gd

@@ -17,7 +17,7 @@ const GOAL_TILES = [7, 8, 9, 10] # Heart, Diamond, Star, Coin
 const HOLO_TILES = [11, 12, 13, 14] # Power-up holo tiles
 
 # Gauntlet overlay layer (v2 ground-growth model — sticky/telegraph on layer 2).
-# Bots must avoid these cells or burn a Cleanser charge to cross.
+# Bots must avoid these cells or use Ghost mode to cross.
 const GAUNTLET_OVERLAY_LAYER: int = 2
 const TILE_STICKY: int = 17
 const TILE_TELEGRAPH: int = 18
@@ -61,23 +61,16 @@ func _get_gauntlet_manager() -> Node:
 				return gm2
 	return null
 
-func _bot_has_cleanser_charge() -> bool:
-	var gm = _get_gauntlet_manager()
-	if not gm or not "player_cleansers" in gm:
+func _bot_has_ghost_powerup() -> bool:
+	"""Check if the bot has a ghost powerup in its SpecialTilesManager inventory."""
+	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
-	return gm.player_cleansers.get(pid, 0) > 0
+	return stm.inventory.get(stm.SpecialEffect.INVISIBLE_MODE, false)
 
-func _is_bot_cleanser_active() -> bool:
-	var gm = _get_gauntlet_manager()
-	if not gm:
-		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
-	return gm.is_cleanser_active(pid)
+func _is_bot_ghost_active() -> bool:
+	"""Check if the bot is currently in ghost (invisible) mode."""
+	return actor.get("is_invisible") == true
 
 func _is_overlay_unsafe(pos: Vector2i) -> bool:
 	"""True if the cell carries a sticky or telegraphed overlay on layer 2."""
@@ -88,10 +81,10 @@ func _is_overlay_unsafe(pos: Vector2i) -> bool:
 
 func _is_cell_unsafe_in_gauntlet(pos: Vector2i) -> bool:
 	"""Cell is unsafe in Gauntlet if it's sticky/telegraphed — unless the bot's
-	Cleanser is active (grants temporary immunity)."""
+	Ghost mode is active (grants sticky bypass)."""
 	if not is_gauntlet_mode():
 		return false
-	if _is_bot_cleanser_active():
+	if _is_bot_ghost_active():
 		return false
 	var gm = _get_gauntlet_manager()
 	if gm and gm.has_method("is_sticky_cell") and gm.is_sticky_cell(pos):
@@ -106,13 +99,13 @@ func _count_unsafe_neighbors(pos: Vector2i) -> int:
 			count += 1
 	return count
 
-func should_activate_cleanser_now() -> bool:
-	"""True if the bot is boxed in / about to be sealed and should burn Cleanser."""
+func should_activate_ghost_now() -> bool:
+	"""True if the bot is boxed in / about to be sealed and should use Ghost powerup."""
 	if not is_gauntlet_mode():
 		return false
-	if not _bot_has_cleanser_charge():
+	if not _bot_has_ghost_powerup():
 		return false
-	if _is_bot_cleanser_active():
+	if _is_bot_ghost_active():
 		return false
 	var here = actor.current_position if actor and "current_position" in actor else Vector2i(-1, -1)
 	if here == Vector2i(-1, -1):
@@ -623,7 +616,7 @@ func _is_valid_move_target(pos: Vector2i, ignore_players: bool = false) -> bool:
 	# Gauntlet mode (#075): reject cells that are sticky or telegraphed —
 	# stepping onto them either traps the bot or strands it within 1s.
 	# Safety applies even when ignore_players is true (a sticky cell is unsafe
-	# regardless of whether another player is on it). Cleanser-active bots are
+	# regardless of whether another player is on it). Ghost-active bots are
 	# exempt via the helper.
 	if _is_cell_unsafe_in_gauntlet(pos):
 		return false