feat(simulation): prefer rover world terrain

tests/test_simulation_projects.py

@@ -16,6 +16,7 @@ from k1link.simulation.projects import (
     SimulationProjectConflictError,
     SimulationProjectService,
     SimulationProjectStore,
+    _world_manifest,
 )
 from k1link.web.simulation_projects_api import build_simulation_projects_router
 
@@ -224,6 +225,27 @@ def test_service_materializes_world_manifest_and_deletes_both_copies(tmp_path: P
     assert provider.deleted == ["gsp-20260826000000-deadbeef"]
 
 
+def test_world_manifest_prefers_seed_connected_rover_terrain() -> None:
+    manifest = _world_manifest(
+        "sim-" + "a" * 32,
+        [
+            {
+                "role": "collision-mesh",
+                "logical_path": "collision/scene.collision.glb",
+            },
+            {
+                "role": "rover-terrain-mesh",
+                "logical_path": "rover/terrain.collision.glb",
+            },
+        ],
+    )
+
+    assert manifest["collision"]["available"] is True
+    assert manifest["collision"]["mesh_url"].endswith(
+        "/artifacts/rover/terrain.collision.glb"
+    )
+
+
 def test_service_resumes_a_persisted_provider_job_without_reupload(tmp_path: Path) -> None:
     store = SimulationProjectStore(tmp_path)
     project = store.create(