chore(tooling): install GUT v9.6.0 test framework

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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)