Scaffold sporel-module-map-editor-test

Headless test module that exercises the lib-core.maps v0.4.0 write
APIs end-to-end: load fixture map, paint cells with rotation and
auto-allocate the wall layer, set roof flags, save to a temp file,
re-load (under a patched id to dodge registry collision), and
assert state round-trips.

manifest.module

@@ -0,0 +1,14 @@
+{
+    "id": "sporel-module-map-editor-test",
+    "version": "0.1.0",
+    "kind": "test-module",
+    "api": "^0.1",
+    "entry_point": "init.lua",
+    "asset_aliases": {
+        "fa_terrain_v1": "lib-asset.prototype-fa-starter"
+    },
+    "deps": [
+        {"id":"lib-core.maps","version":"0.4.0"},
+        {"id":"lib-asset.prototype-fa-starter","version":"0.2.0"}
+    ]
+}