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Corrects the request limit on two tools.
get_price_history and get_market_metrics advertised a maximum of 500 while the API caps both at 200. A model asking for 300 spent a round trip to be refused, and got back an HTTP error rather than a description of the constraint it had broken.
Validation now rejects anything over 200 before a request is made, with a message naming the limit. get_order_book_history already had the correct value.
No other changes.