Existing test fixtures (ClaimDrawer, ClaimDrawerHeader, Claims pages)
construct partial ClaimDetail objects without the new slim
lineReconciliation projection. Other SP7 fields follow the optional
pattern (matchedLines?, serviceLinePayments?, claimLevelAdjustments?),
so apply the same to lineReconciliation.
Backend always emits it for matched claims; UI treats absent as
"no per-line audit yet".
Tyler
b3de9c4d22