CalcDailySimpleInterest/CalcDailyCompoundInterest内部逐日循环→分段纯函数(签名不变): - AccrueSimplePeriod: AccruedToday改未缩放累计(TdInterestAmount口径) - AccrueCompoundPeriod: 新增out finalBasis供flowEvent.InterestPrincipal精确赋值 - 修复5处分段边界bug(includeStart/includeEnd/resetCarryInterest interestPeriod=1场景) - 提取BuildSegmentRates消除SimpleInterest/CompoundInterest取率重复 - 影子测试补AccruedToday断言关闭测试盲区 SwapModule零回归(7基线/510通过)