Implement prototype: venue-driven simulation core, scenarios, tests, and playable entrance scene

- Godot 4.3 project scaffold with first-person guard, procedural world,
  interaction HUD, access inspection, radio forms, debug overlay, shift review
- Simulation core: ShiftCoordinator, VenueScenario, EventScheduler, NPCController/FSM,
  AccessVerifier, EscalationManager, RadioSystem, IncidentRecorder,
  ReputationEvaluator, CrowdSystem, EventBus
- Three authored scenarios (Hollywood Blvd building, The Joke Shop, TV studio)
- Custom headless test runner (25 tests) replacing editor-dependent GUT,
  plus GitHub Actions CI
- Documentation workflow live: README, PLAN (tech stack), TODO/DONE, MEMORY

src/test/take_screenshot.gd

@@ -0,0 +1,25 @@
+extends SceneTree
+## Dev helper: run the game windowed for N frames, save a screenshot, quit.
+## Usage: godot --path . -s res://src/test/take_screenshot.gd   (windowed)
+
+var frames := 0
+const TARGET_FRAMES := 300
+
+func _initialize() -> void:
+	# Launch the main scene.
+	var packed: PackedScene = load("res://scenes/main.tscn")
+	var inst: Node = packed.instantiate()
+	root.add_child(inst)
+
+func _process(_delta: float) -> bool:
+	frames += 1
+	if frames == 60:
+		var img: Image = root.get_texture().get_image()
+		var err := img.save_png("user://screenshot.png")
+		print("screenshot saved err=", err)
+		quit(0)
+		return true
+	if frames > TARGET_FRAMES:
+		quit(0)
+		return true
+	return false