Remove BLACKBIRDHandleMarkInterfaceReadyIoctl and its auth predicate. The
MarkControllerReady path is simplified to call BLACKBIRDProcessMonitorRegisterControllerPid
directly, dropping the now-redundant process-monitor membership check.
Add Tempus timing around BLACKBIRDPublishRecordToSubscribers, BLACKBIRDHandleGetEventIoctl,
and BLACKBIRDHandleGetStatsIoctl. The stats response now exposes TempusEnabled,
TempusSubsystemCount, TempusQpcFrequency, and the per-subsystem bucket array so the
analysis interface can surface kernel-side timing data.