Aave V4 Config Engine

Aave Labs published a high-level overview of the Aave V4 config engine, the tooling used to compose and execute onchain governance payloads that change protocol configuration. The engine, which underpinned most Aave V2 and V3 governance payloads for parameter updates, asset listings, and permission changes, continues under V4 with a larger surface due to the hub-and-spoke architecture. It is implemented as a stateless contract, AaveV4ConfigEngine, acting as a facade over four sub-engines covering Hub, Spoke, AccessManager, and PositionManager actions, with payload authors inheriting from AaveV4Payload and executing categories in a fixed order for easier community review.