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haelyra eb267762a1 test(x402): reject a provably invalid ECDSA scalar
Zero the 32-byte r scalar while preserving the signature encoding, length, s and recovery byte. The previous tail overwrite could leave r/s unchanged and normalize recovery 27 to 0, preserving a valid payment. Keep and strengthen no-claim/no-handler/no-settlement checks before serving the original valid payment.
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