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feat: add slot-4 EdDSA MPC Safe recovery derivation - #9937
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pranishnepal
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Adds offline recovery-key derivation for slot-4 EdDSA MPC Safe wallets.
Tests
sdk-lib-mpc: check that both shares identify the same child and different accounts produce different children.sdk-core: compare recovery with a local mint-style derivation, verify signatures atm/0andm/3, and reject the root keychain.Ticket: WCN-2737