Initial commit: SpaceshipTest, a top-down space RTS in Godot 4.7.1

A fleet of neon-outlined ships explores a procedurally generated, seeded
infinite world: tap/joystick steering, pinch zoom, formation pivoting,
planet landings, an ore economy with extractors and haulers, and player
built structures (mothership, ship crafter, command centre).

All art is hand-drawn with draw_* calls rather than textures, and the
backgrounds are camera-relative shaders so they stay precise at large
world coordinates.

Includes a 35-test headless suite (tests/run_tests.sh) plus screenshot
tooling that renders real frames through Xvfb and Mesa softpipe, since
--headless has no GPU.

Excluded from version control: .godot/ (import cache, and it holds
export credentials), builds/, android/build/ and packaged APKs - all
regenerable, and ~325 MB combined.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

tests/test_icon_button_drag_cancel.gd

@@ -0,0 +1,56 @@
+extends SceneTree
+
+# Headless gameplay test: run with
+#   godot --headless -s res://tests/test_icon_button_drag_cancel.gd
+# Verifies IconButton only counts as pressed if the finger/cursor is still
+# over the button when it lifts - dragging off the button before
+# releasing (a standard way to "cancel" a touch/click) must NOT still
+# trigger it, and releasing back inside the button's bounds must.
+
+var main_scene: Node
+var map_button: IconButton
+var press_count: int = 0
+
+
+func _initialize() -> void:
+	var packed: PackedScene = load("res://Main.tscn")
+	main_scene = packed.instantiate()
+	root.add_child(main_scene)
+	map_button = main_scene.get_node("UI/MapButton")
+	map_button.pressed.connect(_on_pressed)
+
+
+func _process(_delta: float) -> bool:
+	var inside: Vector2 = map_button.size / 2.0
+	var far_outside: Vector2 = map_button.size * 10.0
+
+	# Press inside, release far outside the button's rect - must NOT fire.
+	_touch(true, inside)
+	_touch(false, far_outside)
+	var cancel_ok: bool = press_count == 0
+	print("after_drag_off press_count=%d cancel_ok=%s" % [press_count, cancel_ok])
+
+	# Press and release both inside - must fire normally.
+	_touch(true, inside)
+	_touch(false, inside)
+	var normal_press_ok: bool = press_count == 1
+	print("after_normal_press press_count=%d normal_press_ok=%s" % [press_count, normal_press_ok])
+
+	if cancel_ok and normal_press_ok:
+		print("TEST_ICON_BUTTON_DRAG_CANCEL: PASS")
+		quit(0)
+	else:
+		print("TEST_ICON_BUTTON_DRAG_CANCEL: FAIL")
+		quit(1)
+	return true
+
+
+func _touch(is_pressed: bool, at_position: Vector2) -> void:
+	var ev: InputEventScreenTouch = InputEventScreenTouch.new()
+	ev.pressed = is_pressed
+	ev.position = at_position
+	map_button._gui_input(ev)
+
+
+func _on_pressed() -> void:
+	press_count += 1