docs(index): record OtOpcUa's two redundancy corrections and the NU1903 pin
Both are consumer-visible, so they belong in the index rather than only in the repo. The downing strategy moved to AutoDowning because a two-node OtOpcUa pair on keep-oldest could not survive a crash of the oldest node — the same defect and the same fix as ScadaBridge cf3bd52f, which is where the analysis came from. And the redundancy Primary is now the oldest Up driver member rather than the role leader, which changes which node advertises ServiceLevel 250 after a restart — relevant to anything selecting a server by ServiceLevel. Also notes that the four NU1903 advisories which broke ScadaBridge's fresh restores were breaking OtOpcUa's too, and that the election remains scoped per Akka cluster until the per-cluster mesh work lands. Claude-Session: https://claude.ai/code/session_01GASWkNEi68FSCtvr6rLoEW
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