docs(index): OtOpcUa MQTT driver — write-through (#508), Sparkplug primary-host STATE (#511), structured Template/DataSet flattening (#515)
All three live-gated and merged to OtOpcUa master. The index still said write-through was deferred and every MQTT node read-only, which #508 changed on 2026-07-31; #511 and #515 landed in merge 857a10b4. Two of the three are consumer-visible to ScadaBridge: MQTT nodes now materialize Operate rather than ViewOnly where a write destination is declared, and a Sparkplug UDT surfaces as ordinary scalar nodes instead of being skipped.
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