08d0fb2ede
Added comprehensive tests for the USB hub descriptor structures: - HubPortStatusV2 default bits - HubPortStatusV2::POWER | CONNECTION bit check - HubPortStatusV3 default bits - HubPortStatusV3 LINK_STATE bit position - HubDescriptorV2 default fields - HubDescriptorV3 default fields (with packed u16 handling) - HubPortFeature enum values Resolves IMPROVEMENT-PLAN §3.4: 'Add test suites for usbscsid and usbhubd' (7 new tests for the hub descriptor layer, complementing the 4 existing usbscsid tests).