Agent Action that polls a Xochi intent until it reaches a terminal status.

It never signs or moves funds, so it does not authorize a spend. It does reconcile the execute-time budget reservation at a terminal status: a refund releases it (SpendGate.release_by_intent/2, idempotent), any other terminal status forgets the tag while the spend stands. Pass the same :ledger and :agent_id used for the execute for this to take effect; without them it is a no-op and the reservation is left untouched.

Context keys

• :xochi_config -- %{base_url:, auth:} for Xochi.Client (e.g. auth: {:mandate, agent_wallet}; see Xochi.Client for all auth modes).
• :ledger, :agent_id -- optional; the Ledger and key from the execute, so a refund releases that reservation. See SpendGate.