docs(index): OtOpcUa ClusterClient→gRPC migration — Phases 0-2 merged (rig default Grpc), Phase 3 deletion complete on branch pending merge
Claude-Session: https://claude.ai/code/session_014WNM4vjoVksyyBraTXSZE1
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Claude-Session: https://claude.ai/code/session_014WNM4vjoVksyyBraTXSZE1