[codex] Publish Intrade trading condition snapshots

[LimiNode]

Summary

• add an Intrade Bar TradingConditionManager that publishes supported symbol/option condition snapshots through the existing platform callback
• refresh market/session, amount, open-trade, and sprint-duration conditions on account events and time changes
• share one canonical Intrade symbol list across validation, FX websocket support, and condition generation
• document why Intrade payout remains absent until condition scope can identify amount and duration
• cover direct platform callbacks and TradingConditionHub routing with Intrade-focused tests

Contract

• condition snapshots start after account type and currency are known
• only scopes whose values changed are emitted
• old account scopes receive tradable=false when account identity changes
• exact payout remains an AccountInfoRequest query because it depends on concrete trade parameters

Checks

• intrade_bar_api_response_test.exe --gtest_brief=1: 84 passed
• trading_condition_hub_test.exe --gtest_brief=1: 8 passed
• header_only_odr_test.exe --gtest_brief=1: 4 passed
• trade_manager_test.exe --gtest_brief=1: 21 passed
• market_data_subscription_contract_test.exe --gtest_brief=1: 21 passed
• git diff --cached --check

Follow-up

• On full platform shutdown, publish terminal trading-condition updates with tradable=false before clearing manager state, so a long-lived TradingConditionHub cannot retain stale tradable snapshots; cover this with a regression test.