Runtime hygiene: fix RefCounted cycles (clean suite exit), full-length shifts, wand cooldown

- FSM holds owner via WeakRef; ShiftCoordinator is RefCounted (logic-only);
  persistence tests free the Save node -> test suite exits with zero
  'resources still in use' warnings (was ~13) and 57/57 pass
- GameManager uses each scenario's shift_duration_s (900s ~ 10-15 min) for
  real shifts instead of the 300s test duration
- Wand screening gets a 0.8s recharge cooldown with a wand.recharge message
- TODO/DONE/MEMORY/README synced

src/core/fsm.gd

@@ -2,15 +2,26 @@ class_name FSM
 extends RefCounted
 ## Minimal generic finite state machine used by NPCController and ShiftCoordinator.
 ## Deterministic and headless-testable.
+##
+## The owner is held through a WeakRef so long-lived owners do not create a
+## reference cycle (FSM <-> owner), which previously leaked RefCounted objects
+## at process exit (see MEMORY.md).
 
 signal state_changed(node: Object, from_state: String, to_state: String)
 
 var current_state: String = ""
 var _transitions: Dictionary = {} # state_name -> Array[{to, guard: Callable}]
-var _owner_node: Object = null
+var _owner_ref: WeakRef = null
 
 func _init(owner_node: Object = null) -> void:
-	_owner_node = owner_node
+	if owner_node != null:
+		_owner_ref = weakref(owner_node)
+
+## The live owner object, or null if it was freed.
+func _owner() -> Object:
+	if _owner_ref == null:
+		return null
+	return _owner_ref.get_ref() as Object
 
 ## Register a transition. guard is an optional Callable(node) -> bool.
 func add_transition(from_state: String, to_state: String, guard: Callable = Callable()) -> void:
@@ -20,7 +31,7 @@ func add_transition(from_state: String, to_state: String, guard: Callable = Call
 
 func start(initial_state: String) -> void:
 	current_state = initial_state
-	state_changed.emit(_owner_node, "", initial_state)
+	state_changed.emit(_owner(), "", initial_state)
 
 ## Attempt to move to `to_state`. Returns true when executed.
 func transition_to(to_state: String) -> bool:
@@ -31,10 +42,10 @@ func transition_to(to_state: String) -> bool:
 		if t["to"] != to_state:
 			continue
 		var guard: Callable = t["guard"]
-		if not guard.is_valid() or guard.call(_owner_node):
+		if not guard.is_valid() or guard.call(_owner()):
 			var from := current_state
 			current_state = to_state
-			state_changed.emit(_owner_node, from, to_state)
+			state_changed.emit(_owner(), from, to_state)
 			return true
 	return false
 
@@ -42,6 +53,6 @@ func can_transition_to(to_state: String) -> bool:
 	for t in _transitions.get(current_state, []):
 		if t["to"] == to_state:
 			var guard: Callable = t["guard"]
-			if not guard.is_valid() or guard.call(_owner_node):
+			if not guard.is_valid() or guard.call(_owner()):
 				return true
 	return false

src/core/shift_coordinator.gd

@@ -1,5 +1,5 @@
 class_name ShiftCoordinator
-extends Node
+extends RefCounted
 
 const Rules := preload("res://src/core/rules.gd")
 const EventBus := preload("res://src/core/event_bus.gd")

src/game/game_manager.gd

@@ -64,7 +64,11 @@ var verifier := AccessVerifier.new()
 var wand_screener := WandScreener.new()
 
 var active_scenario_id := "hollywood_building"
-var scenario_duration_s: float = 300.0 # shortened prototype duration for testing
+## Shift length mirrors the scenario default (900s / 10-15 min per PLAN.md) unless
+## overridden for a test or debug build.
+var scenario_duration_s: float = 900.0
+var _wand_cooldown := 0.0
+const WAND_COOLDOWN_S := 0.8
 var scene_root: Node3D = null
 var npcs: Array = []
 var npc_counter := 0
@@ -103,6 +107,7 @@ func _ready() -> void:
 	guard.cleared_target.connect(_on_guard_clear)
 
 	selected_scenario = _build_scenario(active_scenario_id)
+	scenario_duration_s = selected_scenario.shift_duration_s
 	coordinator = ShiftCoordinator.new()
 	coordinator.setup(selected_scenario, scenario_duration_s, 4242)
 	coordinator.npc_spawn_requested.connect(_spawn_npc)
@@ -169,6 +174,7 @@ func restart_shift() -> void:
 	inspector_current_events = []
 	current_incident_active = false
 	current_incident_npc_id = ""
+	scenario_duration_s = selected_scenario.shift_duration_s
 	coordinator.setup(selected_scenario, scenario_duration_s, 4242)
 	coordinator.start()
 	_last_phase = -1
@@ -552,6 +558,9 @@ func _toggle_inspection() -> void:
 ## Handheld wand inspection (The Joke Shop). Only available when the venue
 ## carries a wand. The wand reports an alert; the player interprets it.
 func _toggle_wand_screening() -> void:
+	if _wand_cooldown > 0.0:
+		hud.log(Strings.lookup("wand.recharge"))
+		return
 	if wand_open:
 		hud.hide_wand()
 		hud.set_wand_icon(false)
@@ -615,6 +624,8 @@ func decide_wand(allowed: bool) -> void:
 	controller.screened = true
 	hud.hide_wand()
 	wand_open = false
+	# Short scan cooldown: the wand must “recharge” between guests (PLAN.md: feel).
+	_wand_cooldown = WAND_COOLDOWN_S
 
 func decide_access(allowed: bool) -> void:
 	var controller: Object = _targeted_controller()
@@ -714,6 +725,8 @@ func _close_incident(outcome: String) -> void:
 	current_incident_npc_id = ""
 
 func _physics_process(delta: float) -> void:
+	if _wand_cooldown > 0.0:
+		_wand_cooldown = maxf(0.0, _wand_cooldown - delta)
 	if coordinator == null or not coordinator.running:
 		return
 	coordinator.tick(delta)

src/test/tests/test_persistence.gd

@@ -20,10 +20,13 @@ func test_save_round_trip() -> bool:
 	var last: Dictionary = results[results.size() - 1]
 	var c := TestUtils.check_eq(last.get("scenario_id", ""), "hollywood_building", "round-trips scenario id")
 	var d := TestUtils.check_eq(float(last.get("reputation", {}).get("rating", 0.0)), 82.5, "round-trips rating")
+	save.free()
 	return a and b and c and d
 
 func test_load_returns_array_when_empty_or_missing() -> bool:
 	# The tester home may already contain results; this only asserts shape safety.
 	var save := _save_instance()
 	var results: Array = save.load_shift_results()
-	return TestUtils.check(results is Array, "load_shift_results always returns Array")
+	var ok := TestUtils.check(results is Array, "load_shift_results always returns Array")
+	save.free()
+	return ok

src/test/tests/test_strings.gd

@@ -30,7 +30,7 @@ func test_strings_cover_ui_keys() -> bool:
 		"hud.aim_first", "hud.no_one_nearby", "hud.targeting", "hud.no_wand",
 		"hud.screen_first", "access.granted", "access.denied", "access.policy_satisfied",
 		"access.wrong_grant", "access.wrong_deny", "wand.admitted_prohibited",
-		"wand.denied_false_alarm", "wand.cleared", "wand.refused", "radio.address_first",
+		"wand.denied_false_alarm", "wand.cleared", "wand.refused", "wand.recharge", "radio.address_first",
 		"radio.blocked", "radio.inaccurate", "radio.received", "radio.emergency_dispatched",
 		"responder.arrived", "react.comply", "react.leave", "react.argue", "react.record",
 		"react.ignore", "react.threaten", "react.force_entry", "react.return_later",