Treasury yield-harvester invocation, $10 probe. Treasury approves Harvester (0xc5101c0E2Ab87Ed65eB978ea95d3632808494668) for 10 USDC, then calls harvest(10e6). Harvester contract: recipient() returns Treasury, harvest(amount) performs USDC.transferFrom(msg.sender, recipient, amount). At current state this routes 10 USDC from Treasury back to Treasury — a no-op self-transfer through the harvester wrapper. Validates the integration path before larger flows.