Add another gym about scene switching

docs/gyms/gym09_scene_switching/gym09_controller.gd

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+# ============================================================
+# Gym 09 — Scene Switching Controller
+# ============================================================
+# This root node handles:
+# 1. Starting the right timeline on scene load
+#    (intro on first visit, congrats after minigame)
+# 2. Catching the [signal arg=start_minigame] to change scenes
+# ============================================================
+extends Node2D
+
+const MINIGAME_SCENE_PATH := "res://docs/gyms/gym09_scene_switching/gym09_minigame.tscn"
+
+@export var intro_timeline: DialogicTimeline
+@export var congrats_timeline: DialogicTimeline
+
+
+func _ready() -> void:
+	# Connect to signal events from timelines
+	Dialogic.signal_event.connect(_on_dialogic_signal)
+
+	# Check if we're returning from the minigame
+	if Dialogic.VAR.Gym.minigame_done:
+		print("[Gym09 Controller] Returning from minigame — starting congrats timeline.")
+		Dialogic.VAR.Gym.minigame_done = false
+		Dialogic.start(congrats_timeline)
+	else:
+		print("[Gym09 Controller] First visit — starting intro timeline.")
+		Dialogic.start(intro_timeline)
+
+
+func _on_dialogic_signal(argument: Variant) -> void:
+	if argument is String and argument == "start_minigame":
+		print("[Gym09 Controller] Signal 'start_minigame' received — switching to minigame scene.")
+		# Tell the minigame where to return
+		Dialogic.VAR.Gym.minigame_return = "standalone"
+		await get_tree().create_timer(0.3).timeout
+		get_tree().change_scene_to_file(MINIGAME_SCENE_PATH)