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## Why are these changes needed?
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## Related issue number
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Unlike with the InProcessRuntime, there is a two-phase initialization,
first when AgentsApp is built (when initial agents are registered) and
when it StartAsync()s and connects to the Gateway. Unfortunately, it is
possible to attempt to send direct RPC calls to the Gateway before the
message channel is opened; in this case, the Gateway has no connected
client corresponding to the RPC's clientId, and falls over.
The fix is to defer registering agents and subscriptions with the
gateway until after the connection is established after .StartAsync() is
called.
Changes to align the .NET code more with the python codebase.
* rename *Worker to *Runtime
* refactor shared runtime elements to AgentRuntimeBase
* align runtime interface with python
## Why are these changes needed?
Aligning the .NET with the python code and then we can evolve together
from there.
## Related issue number
Closes#5201
Xiaoyun Zhang
Jacob Alber
Jack Gerrits
Griffin Bassman
Ryan Sweet