mt5cli

Use the `mt5cli` CLI to export MetaTrader 5 data (rates, ticks, account, symbols, orders, positions, history) to CSV, JSON, Parquet, or SQLite3. Invoke when the user asks to export, dump, download, or fetch MT5 market data or account data to a file.

Run local QA including formatting, linting, and testing for the repository. Use whenever any file has been updated.