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>

ShipExplosionVFX.gd

@@ -0,0 +1,12 @@
+class_name ShipExplosionVFX
+extends LightBurstVFX
+
+
+func _init() -> void:
+	color = Color(0.25, 0.85, 1.0)
+
+
+static func spawn(parent: Node, world_position: Vector2) -> void:
+	var vfx: ShipExplosionVFX = ShipExplosionVFX.new()
+	vfx.position = world_position
+	parent.add_child(vfx)