Post-Mortem: Exchange Rate Misallignment on wstETH Core and Prime Instances

A misconfiguration in the CAPO risk oracle lowered the wstETH/stETH exchange rate used on Aave's Ethereum Core and Prime instances, triggering about 10938 wstETH in E-Mode liquidations. The root cause was that the snapshot ratio could only increase by 3% every 3 days, while the snapshot timestamp fully advanced to a 7-day-old reference, producing a cap of roughly 1.1939 below the live rate. The effective exchange rate fell about 2.85%, and no bad debt was incurred. Aave says it recaptured 141 ETH through BuilderNet refunds and will use these funds to compensate affected users, with DAO treasury funds covering any shortfall.