CHW-4903 ActionTypeUnsupported

undo is not supported for this action type; use the Web UI or delete+recreate the resource

Default message: undo is not supported for this action type; use the Web UI or delete+recreate the resource
HTTP status: 400 (client)

Problem. The action type has no registered inverse mutation but could be undone via another surface. Cause. The action shape is recognised but the undo service does not (yet) know how to invert it. Fix. Use the Web UI to compensate, or delete + recreate the resource. HTTP 400. Distinct from CHW-4904 (irreversible).