Make RustRaptor the repository root and track its playable bundle

art/provenance.json

@@ -0,0 +1,11 @@
+{
+  "format_version": 1,
+  "assets": [{
+    "file": "menu-background-v1.png",
+    "purpose": "Full-color main menu and hangar background",
+    "tool": "built-in image_gen",
+    "prompt_file": "menu-background-v1.prompt.txt",
+    "source": "newly authored illustration; no original game pixels supplied",
+    "review": "Inspected generated output; dark negative space supports menu overlays. Actual composed menu reviewed in screenshot audit."
+  }]
+}