* Use copilot to improve XML docs for M.Agents.AI{.Abstractions}
Asked copilot to help improve some of the docs, then I reviewed them.
I also cleaned up a few things along the way, like a couple of extension method types that should be combined.
* Update dotnet/src/Microsoft.Agents.AI.Abstractions/InMemoryChatMessageStore.cs
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Co-authored-by: Mark Wallace <127216156+markwallace-microsoft@users.noreply.github.com>
* Update OpenTelemetryAgent to latest spec
It was stale. Rather than try to keep it up-to-date manually, I've changed it to piggy back on OpenTelemetryChatClient, so that it inherits everything OpenTelemetryChatClient does and then augments it just with agent-specific tags.
* Address feedback / merge