docs(index): OtOpcUa per-cluster mesh Phases 1/2/3 done (config fetch-and-cache)
Update the OtOpcUa entry: the per-cluster mesh election-scoping fix now has Phases 0a/0b/1/2/3 merged + pushed (tip d01b0695). Phase 2 = ClusterClient command transport (MeshTransport:Mode dark switch). Phase 3 = config fetch-and-cache — a FetchAndCache driver node boots + serves last-known-good with central SQL down (extends the #485 availability guarantee consumers like ScadaBridge rely on); a failed fetch is 'no answer', never an empty config. Live gate caught + fixed a Status==Sealed serve-gate deadlock. Claude-Session: https://claude.ai/code/session_01GASWkNEi68FSCtvr6rLoEW
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