支持日期化仓位调整回放

README.md

@@ -2,6 +2,16 @@
 
 面向中国 A 股和期货策略的 Rust 回测核心。仓库目标是提供平台自有的策略 DSL、执行模型、撮合模型和结果分析能力，最终由 `fidc-backtest-service` 对外提供策略运行服务。
 
+## Runtime position exposure schedule
+
+`strategy_spec.runtimeExpressions.risk.positionExposureSchedule` accepts dated
+`effectiveDate` plus `targetExposureBps` points. The platform expression strategy
+uses the latest point whose date is not later than the current execution date and
+otherwise keeps the strategy's normal `exposureExpr`. This contract is intended for
+audited runtime controls replayed by paper/live shadow reconciliation; it is not a
+market-data signal and does not change selection, pricing, fees, or execution-day
+risk checks.
+
 ## 当前能力
 
 - 日频和分钟执行价策略生命周期与确定性回放。