docs(index): record OtOpcUa's MTConnect Agent driver (merged to master, PR #506)
Keeps the umbrella index in step with the OtOpcUa driver set, per the propagation rule in that repo's CLAUDE.md. Read-only Agent driver: hand-rolled HTTP/XML client (probe/current + multipart /sample pump), TrakHound dependency evaluated and dropped, browse free via the Wave-0 universal discovery browser, write-back deferred. Live-gated against a real mtconnect/agent 2.7.0.12 fixture.
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