Add all pro exchanges to public data smoke tests

Adds 57 individual smoke tests covering every pro exchange with the full
validation suite (describe, status, ticker, tickers, order_book, ohlcv).
Softens status shape check to handle raw exchange response variance.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: Herklos