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>

AsteroidExplosionVFX.gd

@@ -0,0 +1,29 @@
+class_name AsteroidExplosionVFX
+extends ExplosionVFXBase
+
+# Tumbling rock-chunk debris, distinct from the energy-ship light-burst
+# style - asteroids are matter, not light.
+
+const COLOR: Color = Color(0.65, 0.5, 0.35)
+
+
+static func spawn(parent: Node, world_position: Vector2) -> void:
+	var vfx: AsteroidExplosionVFX = AsteroidExplosionVFX.new()
+	vfx.position = world_position
+	parent.add_child(vfx)
+
+
+func _random_particle_size() -> float:
+	return randf_range(3.0, 7.0)
+
+
+func _draw_particle(p: Dictionary, alpha: float) -> void:
+	var s: float = p["size"]
+	var local_pts: PackedVector2Array = PackedVector2Array([
+		Vector2(-s, -s * 0.6), Vector2(s * 0.7, -s * 0.5),
+		Vector2(s, s * 0.5), Vector2(-s * 0.6, s),
+	])
+	var world_pts: PackedVector2Array = PackedVector2Array()
+	for pt in local_pts:
+		world_pts.append(p["pos"] + pt.rotated(p["rot"]))
+	draw_colored_polygon(world_pts, Color(COLOR.r, COLOR.g, COLOR.b, alpha))