feat(maps-test): migrate to test-lib (manifest.lib + run_tests) (Test-Opt Phase 3.1)

Per ADR-0037 Tests-as-Libs Convention.

- manifest.module -> manifest.lib with role: 'test'
- init(ctx) -> M.run_tests(ctx) entry-point export
- No assertion-body change

Repo renamed on Gitea: sporel-module-lib-core.maps-test -> sporel-lib-core.maps-test
Local moved: sporel-modules/lib-core.maps-test/ -> sporel-libs/lib-core/maps-test/
History preserved.

manifest.lib

@@ -0,0 +1,9 @@
+{
+    "id": "lib-core.maps-test",
+    "role": "test",
+    "version": "0.1.0",
+    "api_min": "0.1",
+    "deps": [
+        {"id": "lib-core.maps", "version": "0.1.1"}
+    ]
+}