Register approval.instance.status_changed_v4 and approval.task.status_changed_v4 with custom flattened schemas and user-auth pre-consume subscription setup.
Handle approval subscription_type as optional multi-value pre-registration metadata: omitted values register both involved and managed relations, explicit values can be single, comma-separated, or JSON array, and consumers do not unsubscribe on exit.
Report partial approval subscription registration failures with registered and failed relation context while preserving the underlying typed error classification.
Document approval event output fields and subscription semantics, and refresh approval skill references from API metadata.
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