Initial commit: Transcience MVP

Top-down twin-stick bullet-hell, Godot 4.7, server-authoritative dedicated
server with client-side prediction. Clients send input only; the server
resolves every hit for both players and enemies (no PvP).

- SimWorld: whole simulation as plain RefCounted objects (no nodes, no
  physics server), ~0.24ms/tick at peak load -- runs headless for free and
  drives 78 tests in under a second
- BulletPool: struct-of-arrays bullet storage, replicated as spawn/despawn
  events rather than per-tick state
- Emitter framework (Ring/AimedSpread/WallGap/ArcSweep) shared by trash
  enemies and bosses -- a new boss is data in src/content/content.gd, no
  simulation changes
- The Warden of the Fold: stationary 4-phase boss built entirely on that
  format
- Lobby hub with a portal into on-demand dungeon instances; one process
  hosts the hub plus every concurrent dungeon
- Emergency escape: 3s server-owned channel, cancelled by damage
- tools/check.sh, test.sh (GUT), smoke.sh (real server + bot clients over
  ENet), bench.gd; git hooks wired to the same scripts
- docs/ARCHITECTURE.md, NETCODE.md, WORKFLOW.md, ROADMAP.md

addons/gut/godot_singletons.gd

@@ -0,0 +1,50 @@
+
+# This file is auto-generated as part of the release process.  GUT maintainers
+# should not change this file manually.
+static var class_ref = [
+	AccessibilityServer,
+	AudioServer,
+	CameraServer,
+	ClassDB,
+	DisplayServer,
+	# excluded: EditorInterface,
+	Engine,
+	EngineDebugger,
+	GDExtensionManager,
+	# excluded: GDScriptLanguageProtocol,
+	Geometry2D,
+	Geometry3D,
+	IP,
+	Input,
+	InputMap,
+	JavaClassWrapper,
+	JavaScriptBridge,
+	Marshalls,
+	NativeMenu,
+	NavigationMeshGenerator,
+	NavigationServer2D,
+	NavigationServer2DManager,
+	NavigationServer3D,
+	NavigationServer3DManager,
+	OS,
+	Performance,
+	PhysicsServer2D,
+	PhysicsServer2DManager,
+	PhysicsServer3D,
+	PhysicsServer3DManager,
+	ProjectSettings,
+	RenderingServer,
+	ResourceLoader,
+	ResourceSaver,
+	ResourceUID,
+	TextServerManager,
+	ThemeDB,
+	Time,
+	TranslationServer,
+	WorkerThreadPool,
+	XRServer
+]
+static var names := []
+static func _static_init():
+	for entry in class_ref:
+		names.append(entry.get_class())