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>

Rock.tscn

@@ -0,0 +1,12 @@
+[gd_scene load_steps=3 format=3]
+
+[ext_resource type="Script" path="res://Rock.gd" id="1"]
+
+[sub_resource type="CircleShape2D" id="1"]
+radius = 26.0
+
+[node name="Rock" type="Area2D"]
+script = ExtResource("1")
+
+[node name="CollisionShape2D" type="CollisionShape2D" parent="."]
+shape = SubResource("1")