a8f4be616b
FolderEventDeliveryPerfTests (Category=Perf, skipped unless OTOPCUA_EVENT_PERF=1) reports per-alarm-report node-manager Lock hold and end-to-end delivery latency for one equipment folder with N = 1/10/50/200 event items, ACL on/off, folder subscribers publishing or stalled at a full queue; the latency of an i=2253 subscriber while folder subscribers stall; and a QueueSize sensitivity sweep. Compiles against the pre-#855 tree for a before/after comparison. Claude-Session: https://claude.ai/code/session_01GT67AD99zQQqpLCVm3p7xk