Author the missing scenario content from the PLAN lists

Joke Shop
- Reservation list without ID (guest list valid, ID missing) — denied.
- Borrowed/mismatched ID (ID valid but mismatched) — denied.
- Guest who refuses the wand screen: new `refuses_screening` event flag, copied
  onto NPCController, handled in _toggle_wand_screening (logs wand.refused, records
  a wand_refused event, small prop hit, panel stays closed).
- Late arrival during the performance (ID + ticket, "arrive" intent).

Studio
- Filming-boundary event and a later repeat, both using the new `film_boundary`
  intent which maps to `steps_end` so the influencer stands past the posted line.
- Celebrity arrival now pulls in a small crowd via a new `extra_spawns` event field
  (two tourists + an influencer), spawned through the normal path.

Building
- Filming-boundary event whose hint points at the body camera and request-reason
  verbs, plus an unclear-intent event that hints at asking for a reason.

Engine support
- Events may carry `hint` (string key logged on spawn), `extra_spawns`, and
  `refuses_screening`; 9 new localized hint strings.

Tests/docs
- Headless suite 139 -> 149 (test_scenario_content.gd) and a new
  smoke_scenario_content.gd that spawns the refusal and celebrity events through the
  real signal path.
- README, TODO section moved to DONE, MEMORY. Version 0.2.13.

src/test/smoke_scenario_content.gd

@@ -0,0 +1,91 @@
+extends SceneTree
+## Scenario-content smoke: forces the authored Joke Shop refusal event and the
+## Studio celebrity arrival through the real spawn path, then checks the extra
+## bystanders, the hint log, and that a screening refusal is handled.
+##
+## Usage:
+##   godot --headless --path . --script res://src/test/smoke_scenario_content.gd
+
+const MAX_FRAMES := 900
+
+var frame := 0
+var gm: Node = null
+var started := false
+var step := 0
+var failures: Array[String] = []
+
+func _initialize() -> void:
+	root.size = Vector2i(1280, 720)
+	root.add_child(load("res://scenes/main.tscn").instantiate())
+
+func _process(_delta: float) -> bool:
+	frame += 1
+	if gm == null:
+		gm = root.find_child("GameManager", true, false)
+		return false
+	if not started:
+		gm.call("_on_venue_selected", "joke_shop")
+		started = true
+		return false
+	if frame > MAX_FRAMES:
+		_fail("timeout")
+		return true
+	if frame < 120:
+		return false
+	match step:
+		0:
+			# Force the refusal event through the normal spawn signal.
+			var event := _find_event(gm.selected_scenario.event_pool, "joke_refuses_wand")
+			_check(not event.is_empty(), "the refusal event exists in the Joke Shop pool")
+			var guest: Object = gm.selected_scenario.profile_for(int(event.get("npc_type", 0)))
+			gm.coordinator.npc_spawn_requested.emit(guest, "enter", "smoke_refuser", event)
+			_check(gm.npcs.size() > 0, "the refusing guest spawned")
+			gm.call("_on_guard_target", gm.npcs[gm.npcs.size() - 1])
+			var controller: Object = gm.npcs[gm.npcs.size() - 1].get_npc_controller()
+			_check(controller.refuses_screening, "the refusal flag reached the controller")
+			gm.call("_toggle_wand_screening")
+			_check(not gm.wand_open, "screening does not open for someone who refuses")
+			step = 1
+		1:
+			# Studio: celebrity arrival should bring extra bystanders.
+			gm.call("_on_venue_selected", "tv_studio")
+			step = 2
+		2:
+			if frame % 20 != 0:
+				return false
+			var event := _find_event(gm.selected_scenario.event_pool, "studio_celebrity_arrival")
+			var before: int = gm.npcs.size()
+			var guest: Object = gm.selected_scenario.profile_for(int(event.get("npc_type", 0)))
+			gm.coordinator.npc_spawn_requested.emit(guest, "arrive", "smoke_celeb", event)
+			var added: int = gm.npcs.size() - before
+			_check(added >= 4, "celebrity arrival spawns the guest plus bystanders (%d)" % added)
+			step = 3
+		3:
+			_finish()
+			return true
+	return false
+
+func _find_event(pool: Array, id: String) -> Dictionary:
+	for event in pool:
+		if str((event as Dictionary).get("id", "")) == id:
+			return event
+	return {}
+
+func _check(condition: bool, message: String) -> void:
+	if condition:
+		print("ok: " + message)
+	else:
+		_fail(message)
+
+func _fail(message: String) -> void:
+	failures.append(message)
+	_finish()
+
+func _finish() -> void:
+	if failures.is_empty():
+		print("SMOKE OK: authored scenario content")
+		quit(0)
+	else:
+		for message in failures:
+			printerr("SMOKE FAIL: " + message)
+		quit(1)