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Add the EdDSA MPCv2 offline round-2 handler for external signer flows. It restores the encrypted round-1 DSG session and produces the round-2 share plus encrypted carry-over state for round 3. - Restore user DSG session from encrypted round-1 state and verify BitGo round-1 output from txRequest signature shares. - Run WASM round 1 and build the round-2 signature share with user GPG. - Encrypt round-2 session state with MPS_DSG_SIGNING_ROUND2_STATE adata. - Support SJCL and v2 envelope decryption paths for round-1 session input. - Add unit tests with signBitgoEddsaRound1 helper, happy path, and guards. Ticket: WCI-477
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Add the EdDSA MPCv2 offline round-2 handler for external signer flows. It restores the encrypted round-1 DSG session and produces the round-2 share plus encrypted carry-over state for round 3.
Ticket: WCI-477