Cheap iterate check for the CDP settle-blockers of an x402 route: the payment-required header size vs the empirical sett

Cheap iterate check for the CDP settle-blockers of an x402 route: the payment-required header size vs the empirical settle ceiling, WAF-tripping text and method honesty. One unpaid probe of the target. For a seller tweaking output_example and re-checking the header size without paying for a full audit. Diagnostic indicators, not a guarantee.