KarpelesLab / blindsig / 23549923433

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Add secp256k1 blind signatures, rename schnorr to ed25519

Rename schnorr.go → ed25519.go and all Schnorr* types/functions to
Ed25519* for clarity.

Add secp256k1 blind Schnorr signatures (BIP-340 compatible) using the
secp256k1 library. Key differences from Ed25519: subtraction convention
(s=k-ex, R'=R-αG-βP, s'=s-α), x-only R encoding, even-y enforcement
(signer adjusts k at commit time, client retries blinding if R'.y odd),
and BLAKE-256 challenge hash.

64-byte signatures, 33-byte public keys.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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