KarpelesLab / libwallet / 26095420269

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wltwallet: wire frosttss keygen + sign for new ed25519 wallets

Wallets stamped with Protocol="frost" now route through tss-lib's
FROST(Ed25519, SHA-512) implementation (RFC 9591) instead of the
legacy eddsatss GG18-style Schnorr. The output is a stock 64-byte
Ed25519 signature, so callers (Solana, Sui, ...) verify it with
ed25519.Verify and the rest of the sign call site is unchanged.

Key shares get Schema="frost" and ride the existing Bottle/CBOR
encrypt pipeline unmodified — frosttss.Key is plain JSON, no
wrapper needed (unlike dklstss).

initializeEdDSAWallet dispatches into initializeFrostWallet when
Protocol=="frost"; the curve-based API entry point already routes
ed25519 wallets here. Existing legacy eddsa wallets keep working:
empty Protocol still maps through resolveProtocol → eddsa.

Pulls in two transitive deps (filippo.io/edwards25519,
gtank/ristretto255) that tss-lib's group package imports.

Step 4 of the dkls23+frost modernisation. Step 5 (flip the default)
is next.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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