Request a funded settlement for one Guard

The same thing for a single Guard, returning one settlement rather than a list. A wrapper: it builds a one-line request and calls the same service method, so every check -- including the per-request ceiling -- exists in exactly one place and batching buys the caller no headroom. No batch reference, because a lone settlement already has its own.

Required entitlement: regulated.risk-management.canSettleGuard
Entitles the regulated user to settle existing guard positions for their customers