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## Why are these changes needed?

convenience - allows to just run "agenthost"

```
dotnet pack --no-build --configuration Release --output './output/release' -bl\n
dotnet tool install --add-source ./output/release Microsoft.AutoGen.AgentHost
agenthost 
```

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solves. -->

## Related issue number

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closes #5646 

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introduced in this PR.
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Co-authored-by: Ryan Sweet <rysweet@microsoft.com>

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## Why are these changes needed?

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solves. -->

removes unneeded deps

## Related issue number

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Closes #5644

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## Why are these changes needed?

fixing intermittent bug #5580 

was using the wrong scheduler. 

## Related issue number

closes #5580

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## Why are these changes needed?

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## Related issue number

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adding some missing doc comments

sometimes a client will subscribe but the message it was hoping for is
already published and delivered to one of its peers but it missed it.
this adds a five second (default) buffer and will deliver buffered
messages to new subscribers. messages are removed from the buffer after
5 seconds

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Right now if a remote agent sends a message that local agents do not
listen to (and thus will never configure a deserializer for), or if the
first agent in the iteration is one such, the runtime will throw an
unnecessary exception an come down, even though the deserialized message
will never actually be needed before a deserializer is registered.

The fix will downgrade that to a warning.

* Also updates the HelloAgent sample to be more amenable to being used
with gRPC directly, without configuring environment variables.

* integration tests used to use the samples - now they are separate
* patch dictionary problem in serializer
* add Message Registry with dead letter queue that gets checked on new
subs.

the uv sync logging in the test build was really noisy - no longer
needed
## Why are these changes needed?


## Related issue number


## Checks

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This finishes the fix for the race condition between opening a
GrpcWorkerConnection and registering agent types on that worker. Now,
instead of failing to register, we return from the call (with the
expectation that we will finish registration as we set up the
connection)

Part 1: #5494 
Part 2: #5514

---------

Co-authored-by: Ryan Sweet <rysweet@microsoft.com>

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## Related issue number

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* There was an inconsistentcy between the package names that prevented
xlang from working even though the actual types were 1:1 compatible
* Also moves the HelloAgent aspire project into the Hello solution
folder

We were registering the serializers when we already had a concrete type
on the way into Publish or Send on the .NET side. However, in a xLang
scenario, messages could originate from e.g. Python before being
sent/published from .NET, resulting in no serializer being found.

This change adds a second-change registration and lookup when the agent
is instantiated based on the IHandle<T> implementations.

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.

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## Why are these changes needed?

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solves. -->

## Related issue number

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Fix #4731 

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introduced in this PR.
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Restoring the grpc + Orleans server into the project

## Why are these changes needed?

This is the distributed agent runtime for .NET that can manage routing
messages amongst a fleet of grpc agent runtimes.

## Related issue number

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introduced in this PR.
- [x] I've made sure all auto checks have passed.

---------

Co-authored-by: Jack Gerrits <jack@jackgerrits.com>
Co-authored-by: Jacob Alber <jaalber@microsoft.com>

Stands up an initial implementation of the AgentChat project, including abstractions, base classes, and the `RoundRobinGroupChat` implementation.

Co-authored-by: Jacob Alber <jaalber@microsoft.com>
Co-authored-by: Ryan Sweet <rysweet@microsoft.com>

Co-authored-by: Ryan Sweet <rysweet@microsoft.com>

<img width="1840" alt="Screenshot 2025-01-30 at 6 26 02 PM"
src="https://github.com/user-attachments/assets/5b4c9ebf-0880-4b2e-aa1f-f2b956922b49"
/>

This is in preparation for releasing the Microsoft.AutoGen.Core NuGet
package.

* Moves IHandle<> to Microsoft.AutoGen.Contracts
* Makes KVStringParseHelper internal

* Updates versions of certain dependencies
* Updates NuGet package properties

* Enables deterministic build
* Enables ContinuousIntegrationBuild in CI

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Co-authored-by: Jack Gerrits <jack@jackgerrits.com>
Co-authored-by: Ryan Sweet <rysweet@microsoft.com>

Changes `HandlerInvoker` to avoid reflecting for every message when handling arity=2 `IHandler<,>` instances, by moving it out of the final generated delegate.

* Enable configuring SelfDelivery (defaults to false) when using
AgentsAppBuilder
* Also fixes the predicate for self-delivery

---------

Co-authored-by: Griffin Bassman <griffinbassman@gmail.com>

Moves the semantics of message delivery in .NET to be closer to Python
(up to vagaries of differences in Threading)

* Creates a message delivery queue in InProcessRuntime
* Creates Start/Stop/WaitForIdle APIs on InProcessRuntime
* Creates API to step individual messages
* Updates InProcessRuntime to play well with IHost as an IHostedService

formatting

* update getting-started sample

* Fixes issues around SendMessage

* Fixes stackoverflow when calling InMemoryRutnime.RegisterAgentFactoryAsync()