test: let a fixture declare its own workflow settings

Storage-touching nodes are permission-checked against
workflow.settings.storagePermissions, but the harness always created
workflows with an empty settings object, so any node calling
smartbotic.storage.* failed with a permission error inside every
harness-created workflow. Let case.get("settings", {}) pass through
instead of hardcoding {}; every existing fixture omits the key and is
unaffected.

scripts/verify-node.py

@@ -133,7 +133,7 @@ def main():
         "name": case["name"],
         "nodes": case["nodes"],
         "connections": case["connections"],
-        "settings": {},
+        "settings": case.get("settings", {}),
     })
     workflow_id = created.get("id") or created.get("_id")
     if not workflow_id: