docs(index): OtOpcUa — rediscovery is now a prompt; deferment remediation underway
Corrects a fact this index recorded two days ago as consumer-relevant to ScadaBridge. "IRediscoverable is inert fleet-wide" no longer holds: it is consumed as an operator re-browse prompt on /hosts, carried on DriverHealthChanged. The consumer-facing conclusion is unchanged and worth keeping explicit — the served address space still only changes on a config redeploy, because the prompt is advisory by design. Gitea #507 (discovered-node injection) is closed as superseded and its code deleted; it read two structures that are structurally empty in v3, so it could never have injected anything. #521 tracks the still-unconsumed IHostConnectivityProbe. Adds the remediation status for the deferment register (branch feat/deferment-remediation, tip 88ce8df0, unmerged). One item there is operationally visible beyond OtOpcUa: #516 makes a changed DriverConfig stop+respawn the driver rather than an in-place delta, so a config edit now costs a driver reconnect — previously five drivers ignored the edit entirely while the deployment still sealed green.
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