Initial commit — Station 0 vertical slice in progress

Includes full design documentation (ARCHITECTURE, DESIGN_NOTES, CONTENT_SPEC, PRODUCTION_NOTES)
and active Godot 4 / GDScript codebase. Core systems built: player, floor generation,
room system, enemy base, body part upgrades, run manager, save system, HUD, EventBus.

scripts/game_manager.gd

@@ -0,0 +1,51 @@
+extends Node
+
+enum GameState {
+	HUB,
+	RUN,
+	CARD_GAME,
+	CUTSCENE,
+	PAUSED,
+}
+
+var current_state: GameState = GameState.HUB
+var _previous_state: GameState = GameState.HUB
+
+func _ready() -> void:
+	EventBus.run_started.connect(_on_run_started)
+	EventBus.run_ended.connect(_on_run_ended)
+	call_deferred("_load_game")
+
+func _load_game() -> void:
+	SaveManager.load_save()
+
+func change_state(new_state: GameState) -> void:
+	_previous_state = current_state
+	current_state = new_state
+
+func pause() -> void:
+	if current_state != GameState.PAUSED:
+		change_state(GameState.PAUSED)
+		get_tree().paused = true
+
+func unpause() -> void:
+	if current_state == GameState.PAUSED:
+		change_state(_previous_state)
+		get_tree().paused = false
+
+func go_to_hub() -> void:
+	change_state(GameState.HUB)
+	get_tree().change_scene_to_file("res://scenes/hub/hub.tscn")
+
+func start_run() -> void:
+	RunManager.start_run(0, [], [])
+	change_state(GameState.RUN)
+	get_tree().change_scene_to_file("res://scenes/run/floor.tscn")
+
+func _on_run_started() -> void:
+	change_state(GameState.RUN)
+
+func _on_run_ended(_survived: bool) -> void:
+	# Body parts are always kept — save before returning to hub
+	SaveManager.save()
+	call_deferred("go_to_hub")