ecdsafail_gpu_toolkit

GPU-accelerated Fiat-Shamir "island" (DIALOG_TAIL_NONCE) search for the ecdsa.fail quantum point-add challenge. Use whenever optimizing the ecdsa.fail / ecdsafail reversible secp256k1 point-addition circuit and you need to (re-)hunt a clean tail nonce after tightening a config lever (DIALOG_GCD_ACTIVE_ITERATIONS, COMPARE_BITS, APPLY_CLEAN_COMPARE_BITS, WIDTH_SLOPE/MARGIN, KAL carry truncs, etc.), or to measure a lever's Toffoli cost, or to bake + submit a found island. Triggers: "find an island", "re-hunt the nonce", "lower active_iterations", "beat the ecdsa.fail SOTA".