v1.0.6

Fixed

• Report subscription overflow tests — TestSubscribeReport_QueueOverflow and
  TestSubscribeReport_OverflowDropOldest no longer use a fixed sleep plus non-blocking
  drain. They wait for the first delivered report (timeout) before draining the channel,
  which removes a flake under -race on busy CI (observed on Go 1.26).
• Report engine logging — removed accidental stderr debug prints from the URCB
  delayed-send path ([DBG] send OK / send failed). Failures remain on the structured
  logger.

No API changes. No breaking changes.

Import path remains github.com/otfabric/go-iec61850.