Submit a Travel Rule transfer

Submits a virtual-asset transfer for Travel Rule handling. The provider
classifies whether the rule applies and whether the counterparty is a VASP
or a self-hosted wallet, and runs the VASP data exchange. For a self-hosted
counterparty (UNCONFIRMED_OWNERSHIP) we email the originator — supplied via
subject_email, which must be an existing end user of yours — a hosted link
to prove they control the wallet by signing a one-time message; on success we
clear ownership ourselves. decision is our authoritative outcome
(APPROVED / IN_REVIEW / DECLINED / AWAITING_OWNERSHIP). Resubmitting the same
client_reference returns the existing record.