- Document XRP/MPT and IOU short-circuit behaviour in
STAmount::isZeroAtScale
- Disambiguate duplicate "Cover precision guard: Deposit" testcase
names in LoanBroker_test
- Extend testIsZeroAtScale with half-ULP boundary, large-magnitude
gap, and negative-value cases
- Tighten ASSERT in canApplyToBrokerCover to compare full assets
(covers MPT, not just issuer)