The CLI validated, normalized, and classified tickers with its own logic that
diverged from the data layer: it rejected '=' symbols like GC=F (#980),
classified BTCUSD as a stock (#981), and accepted unpriceable BTC-USDT (#982).
Route the CLI through normalize_symbol (now mapping USDT/USDC crypto quotes to
Yahoo's -USD pair), so validation, classification, and pricing agree.