CHW-4406 BillyActionUnsupported
unsupported Billy action type; supply one of the handler-registered action kinds
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Default message: unsupported Billy action type; supply one of the handler-registered action kinds
HTTP status:400(client)
Problem. /api/billy/approve-action refused to dispatch the
proposal. Cause. The type field was either unknown or resolved
to PermissionDenyAll — new action shapes fail closed until their
permission mapping is registered in billy.RequiredPermission. Fix.
Check the client-side proposal builder; pick a known action type.
HTTP 400.