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

assets/data/version.json

@@ -1,7 +1,22 @@
 {
-	"latest_version": "2.4.1",
+	"latest_version": "2.4.2",
 	"minimum_app_version": "2.1.0",
 	"releases": [
+		{
+			"version": "2.4.2",
+			"date": "2026-07-03",
+			"pck_url": "https://raw.githubusercontent.com/adtpdn/tekton-updates/main/latest/patch.pck",
+			"pck_size": 0,
+			"changelog": [
+				"Replaced Cleanser mechanic in Gauntlet with Ghost powerup sticky-bypass system.",
+				"Ghost (Invisible Mode) now lets players walk through sticky candy tiles in Gauntlet.",
+				"Players earn a Ghost powerup every 2 completed missions in Gauntlet.",
+				"Ghost powerup tiles now spawn naturally on the Gauntlet arena (15% chance).",
+				"Removed Cleanser HUD elements from Gauntlet overlay.",
+				"Bots now activate Ghost powerup when boxed in by sticky tiles.",
+				"Players pushed into sticky tiles while in Ghost mode are no longer slowed."
+			]
+		},
 		{
 			"version": "2.4.1",
 			"date": "2026-06-28",