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v0.3.0: pin the payee, bound the spend
payTo: only sign for these payees (address, list, or per-origin map with'*'). Any other payee fails withpayee-mismatchbefore anything is signed; a mixed offer pays the pinned option.budgetUsd: bound the total this client signs (over-budget);client.spentUsd.- CLI:
--pay-to/X402_PAY_TO,--budget-usd.
Opt-in and backward compatible. Without payTo the client still pays whatever payee the 402 names, up to maxUsd: set it if you know who you pay. (#4)