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/gui/gut_dock.gd

@@ -0,0 +1,37 @@
+extends EditorDock
+
+
+var _panel : Control = null
+var _current_layout = -1
+
+
+func _update_layout(layout):
+	_current_layout = layout
+	if(_panel != null):
+		if(layout == DOCK_LAYOUT_FLOATING):
+			_windowed_mode()
+		else:
+			_dock_mode()
+
+
+# -------------
+# Private
+# -------------
+func _windowed_mode():
+	_panel.show_layout_buttons(true)
+
+
+func _dock_mode():
+	_panel.results_horiz_layout()
+	_panel.show_layout_buttons(false)
+
+
+# -------------
+# Public
+# -------------
+func add_bottom_panel(gut_bottom_panel):
+	_panel = gut_bottom_panel
+	# Make floating button not supported right now
+	add_child(_panel)
+	_panel.make_floating_btn.visible = false
+	_update_layout(_current_layout)