Add JsonSerializerContext support for Native AOT compatibility in OllamaSharp integration

[Copilot]

OllamaSharp supports Native AOT when provided with a JsonSerializerContext, but the Aspire integration did not expose this configuration option.

Changes

• OllamaSharpSettings: Added JsonSerializerContext property with XML documentation referencing OllamaSharp's AOT docs
• AspireOllamaSharpExtensions: Updated OllamaApiClient instantiation to use constructor overload accepting JsonSerializerContext and selectedModel
• Tests: Added unit tests verifying context is properly passed for both keyed and non-keyed client registration scenarios
• README: Added Native AOT Support section with usage examples

Usage

[JsonSerializable(typeof(ChatRequest))]
[JsonSerializable(typeof(ChatResponseStream))]
public partial class MyCustomJsonContext : JsonSerializerContext { }

builder.AddKeyedOllamaApiClient("embedding", settings => 
    settings.JsonSerializerContext = MyCustomJsonContext.Default)
    .AddEmbeddingGenerator();

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Original prompt

---

This section details on the original issue you should resolve

<issue_title>Allow passing JsonSerializerContext to Ollama</issue_title>
<issue_description>### Related to an existing integration?

Yes

Existing integration

CommunityToolkit.Aspire.OllamaSharp

Overview

OllamaSharp's client is AOT compatible if you pass in a JsonSerializerContext with the type information.

However, Aspire's integration does not allow passing this field in making it impossible to use this package in an AOT environment.

Usage example

builder.AddKeyedOllamaApiClient("embedding", settings => settings.JsonSerializerContext = MySerializerContext.Default)
	.AddEmbeddingGenerator();

basically add in the option to pass the JsonSerializerContext

Breaking change?

No

Alternatives

currently no alternatives exist to make AOT possible

Additional context

OllamaSharp's documentation refers to this:
https://awaescher.github.io/OllamaSharp/docs/native-aot-support.html

Help us help you

Yes, I'd like to be assigned to work on this item</issue_description>

<agent_instructions>Be sure to refer to https://awaescher.github.io/OllamaSharp/docs/native-aot-support.html for an example of how to use this</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes Allow passing JsonSerializerContext to Ollama #1084

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[Copilot]

Pull request overview

This PR adds Native AOT compatibility to the OllamaSharp integration by exposing the JsonSerializerContext configuration option. OllamaSharp requires a custom JsonSerializerContext for Native AOT scenarios, but the Aspire integration previously did not allow passing this configuration.

Changes:

• Added JsonSerializerContext property to OllamaSharpSettings with XML documentation
• Updated OllamaApiClient instantiation to use constructor accepting JsonSerializerContext
• Added comprehensive test coverage for both keyed and non-keyed client scenarios
• Added Native AOT Support section to README with usage examples

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/CommunityToolkit.Aspire.OllamaSharp/OllamaSharpSettings.cs	Added JsonSerializerContext property with XML documentation linking to OllamaSharp's AOT docs
src/CommunityToolkit.Aspire.OllamaSharp/AspireOllamaSharpExtensions.cs	Updated client instantiation to pass SelectedModel and JsonSerializerContext to constructor
tests/CommunityToolkit.Aspire.OllamaSharp.Tests/OllamaApiClientTests.cs	Added tests verifying JsonSerializerContext is properly passed for keyed and non-keyed clients, plus test with settings overload
tests/CommunityToolkit.Aspire.OllamaSharp.Tests/ConfigurationTests.cs	Added test verifying JsonSerializerContext is null by default
src/CommunityToolkit.Aspire.OllamaSharp/README.md	Added Native AOT Support section with example usage and link to OllamaSharp documentation