feature-f11-special-stock-filter

You can exclude disposal stocks, attention stocks, and day-trade-restricted special stocks by enabling a configurable flag to automatically screen your candidate universe and re-validate each order right before submission.

The best way to prevent accidental buys of day-trade-restricted special stocks is to apply a double-check safety mechanism that refreshes market metadata for candidate screening and confirms special-stock flags right before order placement.

You can configure the special stock exclusion behavior by setting the `f11_enabled` switch to true in your YAML configuration, which defaults to active and automatically blocks special stocks from the trading candidate universe.

Candidate screening for special stocks does not solely guarantee blocking, so a per-order single-stock confirmation re-validates the special-stock flags right before order gating to catch any runtime metadata changes.

If the batch API fails during special stock flag refresh, the system applies a conservative fallback mechanism to ensure risk control measures remain active and restrict potentially unsafe special stocks from execution.