Tune graph layout affinities

tests/test_graph_explorer.py

@@ -41,16 +41,29 @@ def test_graph_explorer_manifest_and_payload_validate() -> None:
 
     assert manifest["profile_persistence"] == "local"
     assert manifest["shareable_state"]["profile_id"] is True
+    assert {layer["id"] for layer in manifest["layers"]} >= {"server", "deployment"}
     nodes = [element for element in payload["elements"] if "source" not in element["data"]]
     edges = [element for element in payload["elements"] if "source" in element["data"]]
     registered_only = next(
         element for element in nodes if element["data"]["id"] == "repo:registered-only"
     )
+    deployment = next(element for element in nodes if element["data"]["kind"] == "Deployment")
+    server = next(element for element in nodes if element["data"]["kind"] == "Server")
+    runs_on = next(edge for edge in edges if edge["data"]["edgeType"] == "runs_on")
+    same_repo_edge = next(edge for edge in edges if edge["data"].get("sameRepo") is True)
+    cross_repo_edge = next(edge for edge in edges if edge["data"].get("layoutAffinity") == "cross-repo")
 
     assert registered_only["data"]["reviewState"] == "candidate"
     assert registered_only["data"]["unresolved"] is True
+    assert deployment["data"]["layer"] == "deployment"
+    assert server["data"]["layer"] == "server"
+    assert runs_on["data"]["layoutIdealLength"] < cross_repo_edge["data"]["layoutIdealLength"]
+    assert runs_on["data"]["layoutElasticity"] > cross_repo_edge["data"]["layoutElasticity"]
+    assert same_repo_edge["data"]["layoutIdealLength"] < cross_repo_edge["data"]["layoutIdealLength"]
     assert any(edge["data"]["edgeType"] == "declares" for edge in edges)
     assert any(node["data"]["sourceReferences"] for node in nodes if node["data"]["kind"] != "Repository")
+    assert payload["metrics"]["deployment_node_count"] >= 1
+    assert payload["metrics"]["server_node_count"] >= 1
     assert payload["metrics"]["registered_repo_count"] == 2
     assert payload["metrics"]["unresolved_count"] == 0
 
@@ -197,6 +210,8 @@ def test_registry_serves_graph_explorer_exports(tmp_path: Path) -> None:
         assert "Interface consumers" in page
         assert "Dependency path" in page
         assert "cytoscape.min.js" in page
+        assert "layoutIdealLength" in page
+        assert "layoutElasticity" in page
         assert "/exports/graph-explorer/manifest" in page
         assert 'data-override="hide"' in page
         assert 'data-profile-action="save"' in page