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defiQUG bee1d29d55 Add full Chain 138 integration: 8 steps, chain spec, app-ethereum config, docs

Co-authored-by: Cursor <cursoragent@cursor.com>

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getAddress.ts

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README.md

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types-signer.ts

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Step 4 — Derivation / Signer

types-signer.ts — Signer interface (Ethereum-style: getAddress, signTransaction, signPersonalMessage). Use as-is for EVM/Chain 138.
getAddress.ts — getAddress resolver using @ledgerhq/coin-framework (GetAddressFn, SignerContext, GetAddressOptions). Register in live-common family setup.

CLI check (after currency is added):

ledger-live getAddress --currency defi_oracle_meta_mainnet --path "44'/60'/0'/0/0" --derivationMode ""

Or with ethereum currency and chainId in config:

ledger-live getAddress --currency ethereum --path "44'/60'/0'/0/0" --derivationMode ""

Derivation for Chain 138: 44'/60'/0'/0/0 (standard EVM BIP44).