docs(review): refresh vEP citations against merged master and reconcile GR completion with FORENSICS-grv5

Line anchors drifted when c33f6006 landed after the doc was written at
d0213b5a (svc_thread, svc_gr_request, svc_pending_add, the H3 guard, the
readiness gate). Also: the grv5 SEMA_DBG=Y campaign showed the notifier and
event wake-up do fire while the counter slot publication is the link that
never writes, so the document's 'completion wake-up' framing was stale in
the stage table, section 3.4, section 6.1, the challenges and the iteration
plan; refresh the status hash, the discovery-cadence wording and the
mode-matrix source note, and extend the change log.

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