Microsoft Agent Framework 1.16.0 stops workflow checkpoints being mutated outside storage and discards unsafe Content on deep copy

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The Python 1.16.0 release of Microsoft Agent Framework, dated 27 August, is mostly a set of state-integrity corrections rather than features. It prevents workflow checkpoints from being mutated outside storage implementations (#7847), discards unsafe Content fields during deep copy (#7903), stops SerializationMixin.from_dict() mutating caller input (#7901), and keeps the private agent-loop iteration marker out of provider SDK requests (#7860). On the observability side it adds configurable timeouts for waiting on the first background-agent task and allows programmatic OpenTelemetry service metadata, resource attributes and OTLP exporter configuration.