ERC-8004 Identity Manager v3

Generates valid EVM transaction data to register or update an Agent Identity on the Base network (ERC-8004). Uses the verified implementation selector 0xf2c298be to interact with the registry proxy (0x8004A169FB4a3325136EB29fA0ceB6D2e539a432), resolving previous ABI mismatch errors. Returns raw transaction fields (to, data, value).