feat: stabilize graph zone containers

tests/test_graph_explorer.py

@@ -422,11 +422,20 @@ def test_registry_serves_graph_explorer_exports(tmp_path: Path) -> None:
         assert "ZONE_NODE_SEEDED_BY_MULTIPLE_ZONES" in page
         assert "ZONE_EDGE_CROSSES_ZONE_BOUNDARY" in page
         assert "zone.diagnostics" in page
+        assert "isZoneContextOnlyEdge" in page
+        assert "isZoneConnectivityEdge" in page
         assert "currentZoneViewState" in page
         assert "normalizeZoneViewState" in page
         assert "zoneDefinitionSet" in page
         assert "zoneDefinitionSets" in page
         assert "fabric-default" in page
+        assert "zoneContainerState" in page
+        assert "ensureZoneContainer" in page
+        assert "packZoneContainers" in page
+        assert "applyZoneContainerLayout" in page
+        assert "layoutZoneSubgraph" in page
+        assert "serializedZoneContainers" in page
+        assert "normalizedZoneContainers" in page
         assert "collapsedZoneSnapshots" in page
         assert "zoneDragState" in page
         assert "startZoneDrag" in page

tests/test_zone_view.py

@@ -96,6 +96,43 @@ def test_resolver_assigns_seed_nodes_and_boundary_edges() -> None:
     }
 
 
+def test_resolver_ignores_context_only_edges_for_boundaries_and_attraction() -> None:
+    resolution = resolve_zones(
+        nodes=[
+            _node("repo", kind="Repository"),
+            _node("svc.prod", deploymentEnvironment="prod"),
+            _node("svc.context", kind="service"),
+        ],
+        edges=[
+            _edge("edge.repo-prod", "repo", "svc.prod", "declares", displayOnly=True),
+            _edge("edge.prod-context", "svc.prod", "svc.context", "declares", displayOnly=True),
+        ],
+        zone_definitions=[
+            {
+                "id": "prod",
+                "label": "prod",
+                "membership": {"field": "deploymentEnvironment", "op": "equals", "value": "prod"},
+                "attraction": {
+                    "rules": [
+                        {
+                            "edge_type": "*",
+                            "direction": "both",
+                            "depth": 1,
+                        }
+                    ]
+                },
+            },
+        ],
+    )
+
+    assert resolution.zone_by_id("prod").boundary_edge_ids == ()
+    assert resolution.zone_by_id("prod").internal_edge_ids == ()
+    assert "svc.context" not in resolution.node_assignments
+    assert "ZONE_EDGE_CROSSES_ZONE_BOUNDARY" not in {
+        diagnostic.code for diagnostic in resolution.diagnostics
+    }
+
+
 def test_resolver_attracts_nodes_by_edge_type_direction_and_depth() -> None:
     resolution = resolve_zones(
         nodes=[