The Ethereum-compatible transaction argument helpers currently disagree on how fee fields and calldata…

The Ethereum-compatible transaction argument helpers currently disagree on how fee fields and calldata…: a task in MiMo-V2.6-RL-oss: Agentic RL Environments (MiMo RL release). Bring the public TransactionArgs behavior into one coherent contract so callers can safely use the same object for…