[hogan-yuan]

Release v5.3.0. Bumps workspace 5.2.2 → 5.3.0.

Minor bump: new US-account APIs, and calls that only work in the AP data center now fail fast with a region error.

New since v5.2.2 (#613)

• Added: US-account asset methods on TradeContext — us_cash_and_buy_power, us_available_holding, us_transaction_history, us_exchange_rates (Rust async + blocking, Node.js, Python; Java JNI entry points). US data-center tokens only.
• Changed: account_balance, cash_flow, stock_positions, fund_positions, margin_ratio, order_detail, all_executions and PortfolioContext.exchange_rate are AP-only. A US data-center account gets HttpClientError::DcRegionRestricted without a request, instead of gateway code 12 / HTTP 500.
• Changed: the DcRegionRestricted message keeps its existing text and appends ; <hint> naming the alternative endpoint. Code that matches the message by exact equality must be updated; prefix matching keeps working.
• Fixed: Execution.side defaults to Unknown when the response omits it (US /v1/trade/execution/history), so history_executions no longer fails to deserialize.
• Fixed: USCryptoEntry carries the full set of fields returned by the gateway (quantity, market, name, prices, ...).
• Fixed: option_chain_info_by_date calls POST /v1/quote/options/strikes.

Verified on a Longbridge US production account before merge: all new US methods return data, history_executions parses fills without side, and every AP-only method returns the region error with its hint.

Only Cargo.toml (workspace version + internal dep reqs) and CHANGELOG.md change.

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