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The TerminalLink (Bloomberg EMSX) brokerage disables order modification (TerminalLinkBrokerage.UpdateOrder always returns false) and does not support Market-on-Close orders. Update TerminalLinkBrokerageModel to reject order updates via CanUpdateOrder and drop MarketOnClose from the supported order types. Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>