State Variables

Variable	Type	Description
asset	IERC20	USDC token address
totalBuffer	uint256	Current USDC balance held in the buffer
approvedVaults	mapping(address => bool)	Authorized vault addresses that can call topUpReserve()
owner	address	Governance address with admin control
pendingOwner	address	Proposed new owner. Set by transferOwnership(). Accepted by the pending address calling acceptOwnership(). address(0) when no transfer is pending.

IHouseBuffer interface inheritance

HouseBuffer does not declare is IHouseBuffer in its implementation. The interface exists as a reference ABI for LiquidityVault to cast against. Inheritance was removed because IERC20 public immutable asset conflicts with function asset() external view returns (address) in the interface — Solidity cannot override a state variable with an interface function of different return type. LiquidityVault interacts with HouseBuffer through IHouseBuffer; function selectors are identical.