Approve Proposal

The customer's yes: post the task and send the offer.

Through the REST API with the customer's own agent key -- the same calls the agent would have made -- so screening, caps and escrow are applied by the code that always applies them. A failure leaves the proposal open with the reason, so they can fix it (add funds, raise a cap) and approve again; a retry reuses the stable idempotency scope and never posts the task twice.