Upgrade NuGet dependencies to latest compatible versions

Bumps the following packages to their latest stable/preview releases:
- Microsoft.SemanticKernel: 1.72.0 -> 1.76.0
- Microsoft.Extensions.Http.Resilience: 10.5.0 -> 10.6.0
- NuGet.Packaging/NuGet.Protocol: 7.3.1 -> 7.6.0
- ModelContextProtocol*: 1.2.0 -> 1.3.0
- Microsoft.SemanticKernel.Connectors.PgVector: 1.72.0-preview -> 1.74.0-preview
- System.CommandLine: 2.0.7 -> 2.0.8
- Microsoft.SourceLink.GitHub: 10.0.203 -> 10.0.300
- Azure.Monitor.OpenTelemetry.Profiler: 1.0.0-beta9 -> 1.0.1-beta.1

**Breaking Changes in OpenAI SDK:**
The upgrade pulls OpenAI 2.10.0 (via Semantic Kernel 1.76.0) which deprecates the old Responses API.
Migrated AIChatService from:
  - OpenAIResponseClient -> ResponsesClient
  - ResponseCreationOptions -> CreateResponseOptions
Updated method invocations to use new signature where InputItems is populated directly
on the options object rather than passed as separate arguments.

All chat service tests pass; build succeeds.

Author: BenjaminMichaelis

Directory.Packages.props

@@ -10,7 +10,7 @@
     <NuGetAudit Condition="'$(AccessToNugetFeed)' != 'true'">false</NuGetAudit>
   </PropertyGroup>
   <PropertyGroup>
-    <SemanticKernelVersion>1.72.0</SemanticKernelVersion>
+    <SemanticKernelVersion>1.76.0</SemanticKernelVersion>
   </PropertyGroup>
   <ItemGroup Condition="$(AccessToNugetFeed)">
     <PackageVersion Include="ContentFeedNuget" Version="$(ToolingPackagesVersion)" />
@@ -23,7 +23,7 @@
     <PackageVersion Include="Azure.Identity" Version="1.21.0" />
     <PackageVersion Include="Azure.Monitor.OpenTelemetry.AspNetCore" Version="1.5.0" />
     <!-- TODO: update to stable release when Azure.Monitor.OpenTelemetry.Profiler reaches GA -->
-    <PackageVersion Include="Azure.Monitor.OpenTelemetry.Profiler" Version="1.0.0-beta9" />
+    <PackageVersion Include="Azure.Monitor.OpenTelemetry.Profiler" Version="1.0.1-beta.1" />
     <PackageVersion Include="TUnit" Version="1.40.5" />
     <PackageVersion Include="EssentialCSharp.Shared.Models" Version="$(ToolingPackagesVersion)" />
     <PackageVersion Include="HtmlAgilityPack" Version="1.12.4" />
@@ -39,22 +39,22 @@
     <PackageVersion Include="Microsoft.EntityFrameworkCore.Sqlite" Version="10.0.8" />
     <PackageVersion Include="Microsoft.EntityFrameworkCore.SqlServer" Version="10.0.8" />
     <PackageVersion Include="Microsoft.EntityFrameworkCore.Tools" Version="10.0.8" />
-    <PackageVersion Include="Microsoft.Extensions.Http.Resilience" Version="10.5.0" />
+    <PackageVersion Include="Microsoft.Extensions.Http.Resilience" Version="10.6.0" />
     <PackageVersion Include="Microsoft.SemanticKernel" Version="$(SemanticKernelVersion)" />
-    <PackageVersion Include="Microsoft.SemanticKernel.Connectors.PgVector" Version="$(SemanticKernelVersion)-preview" />
-    <PackageVersion Include="Microsoft.SourceLink.GitHub" Version="10.0.203" />
+    <PackageVersion Include="Microsoft.SemanticKernel.Connectors.PgVector" Version="1.74.0-preview" />
+    <PackageVersion Include="Microsoft.SourceLink.GitHub" Version="10.0.300" />
     <!-- Pin to patched versions; NuGet.Protocol 6.12.5+ fixes GHSA-g4vj-cjjj-v7hg (pulled in by Microsoft.VisualStudio.Web.CodeGeneration.Design) -->
-    <PackageVersion Include="NuGet.Packaging" Version="7.3.1" />
-    <PackageVersion Include="NuGet.Protocol" Version="7.3.1" />
+    <PackageVersion Include="NuGet.Packaging" Version="7.6.0" />
+    <PackageVersion Include="NuGet.Protocol" Version="7.6.0" />
     <PackageVersion Include="Microsoft.VisualStudio.Azure.Containers.Tools.Targets" Version="1.23.0" />
     <PackageVersion Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="10.0.2" />
-    <PackageVersion Include="Microsoft.Extensions.AI.OpenAI" Version="10.0.1-preview.1.25571.5" />
-    <PackageVersion Include="ModelContextProtocol" Version="1.2.0" />
-    <PackageVersion Include="ModelContextProtocol.AspNetCore" Version="1.2.0" />
+    <PackageVersion Include="Microsoft.Extensions.AI.OpenAI" Version="10.5.0" />
+    <PackageVersion Include="ModelContextProtocol" Version="1.3.0" />
+    <PackageVersion Include="ModelContextProtocol.AspNetCore" Version="1.3.0" />
     <PackageVersion Include="Microsoft.AspNetCore.Authentication.JwtBearer" Version="10.0.8" />
     <PackageVersion Include="Moq" Version="4.20.72" />
     <PackageVersion Include="Moq.AutoMock" Version="4.0.2" />
-    <PackageVersion Include="System.CommandLine" Version="2.0.7" />
+    <PackageVersion Include="System.CommandLine" Version="2.0.8" />
     <PackageVersion Include="Newtonsoft.Json" Version="13.0.4" />
     <PackageVersion Include="Octokit" Version="14.0.0" />
     <PackageVersion Include="OpenTelemetry.Exporter.OpenTelemetryProtocol" Version="1.15.3" />

EssentialCSharp.Chat.Shared/Services/AIChatService.cs

@@ -17,7 +17,7 @@ public partial class AIChatService
     private readonly AIOptions _Options;
     private readonly AzureOpenAIClient _AzureClient;
 #pragma warning disable OPENAI001 // Type is for evaluation purposes only and is subject to change or removal in future updates. Suppress this diagnostic to proceed.
-    private readonly OpenAIResponseClient _ResponseClient;
+    private readonly ResponsesClient _ResponseClient;
 #pragma warning restore OPENAI001 // Type is for evaluation purposes only and is subject to change or removal in future updates. Suppress this diagnostic to proceed.
     private readonly AISearchService _SearchService;
     private readonly ILogger<AIChatService> _Logger;
@@ -34,7 +34,7 @@ public AIChatService(IOptions<AIOptions> options, AISearchService searchService,
         _AzureClient = azureClient;
 
 #pragma warning disable OPENAI001 // Type is for evaluation purposes only and is subject to change or removal in future updates. Suppress this diagnostic to proceed.
-        _ResponseClient = _AzureClient.GetOpenAIResponseClient(_Options.ChatDeploymentName);
+        _ResponseClient = _AzureClient.GetResponsesClient();
 #pragma warning restore OPENAI001 // Type is for evaluation purposes only and is subject to change or removal in future updates. Suppress this diagnostic to proceed.
     }
 
@@ -48,7 +48,7 @@ public AIChatService(IOptions<AIOptions> options, AISearchService searchService,
     /// <param name="reasoningEffortLevel">Optional reasoning effort level for reasoning models</param>
     /// <param name="enableContextualSearch">Enable vector search for contextual information</param>
     /// <param name="endUserId">Authenticated end-user identifier. Currently reserved for forwarding
-    /// to Azure OpenAI for abuse monitoring once the SDK exposes <c>ResponseCreationOptions.User</c>.</param>
+    /// to Azure OpenAI for abuse monitoring via <c>CreateResponseOptions.EndUserId</c>.</param>
     /// <param name="cancellationToken">Cancellation token</param>
     /// <returns>The AI response text and response ID for conversation continuity</returns>
     public async Task<(string response, string responseId)> GetChatCompletion(
@@ -79,7 +79,7 @@ public AIChatService(IOptions<AIOptions> options, AISearchService searchService,
     /// <param name="reasoningEffortLevel">Optional reasoning effort level for reasoning models</param>
     /// <param name="enableContextualSearch">Enable vector search for contextual information</param>
     /// <param name="endUserId">Authenticated end-user identifier. Currently reserved for forwarding
-    /// to Azure OpenAI for abuse monitoring once the SDK exposes <c>ResponseCreationOptions.User</c>.</param>
+    /// to Azure OpenAI for abuse monitoring via <c>CreateResponseOptions.EndUserId</c>.</param>
     /// <param name="cancellationToken">Cancellation token</param>
     /// <returns>An async enumerable of response text chunks and final response ID</returns>
     public async IAsyncEnumerable<(string text, string? responseId)> GetChatCompletionStream(
@@ -100,12 +100,10 @@ public AIChatService(IOptions<AIOptions> options, AISearchService searchService,
 
         // Create the streaming response using the Responses API
 #pragma warning disable OPENAI001 // Type is for evaluation purposes only and is subject to change or removal in future updates. Suppress this diagnostic to proceed.
-        List<ResponseItem> responseItems = [ResponseItem.CreateUserMessageItem(enrichedPrompt)];
+        responseOptions.InputItems.Clear();
+        responseOptions.InputItems.Add(ResponseItem.CreateUserMessageItem(enrichedPrompt));
+        var streamingUpdates = _ResponseClient.CreateResponseStreamingAsync(responseOptions, cancellationToken);
 #pragma warning restore OPENAI001 // Type is for evaluation purposes only and is subject to change or removal in future updates. Suppress this diagnostic to proceed.
-        var streamingUpdates = _ResponseClient.CreateResponseStreamingAsync(
-            responseItems,
-            options: responseOptions,
-            cancellationToken: cancellationToken);
 
         await foreach (var result in ProcessStreamingUpdatesAsync(streamingUpdates, responseOptions, mcpClient, toolCallDepth: 0, endUserId: endUserId, cancellationToken: cancellationToken))
         {
@@ -181,7 +179,7 @@ private static string SanitizeForXmlContext(string? input) =>
     private async IAsyncEnumerable<(string text, string? responseId)> ProcessStreamingUpdatesAsync(
 #pragma warning disable OPENAI001 // Type is for evaluation purposes only and is subject to change or removal in future updates. Suppress this diagnostic to proceed.
         IAsyncEnumerable<StreamingResponseUpdate> streamingUpdates,
-        ResponseCreationOptions responseOptions,
+        CreateResponseOptions responseOptions,
 #pragma warning restore OPENAI001 // Type is for evaluation purposes only and is subject to change or removal in future updates. Suppress this diagnostic to proceed.
         McpClient? mcpClient,
         int toolCallDepth = 0,
@@ -247,7 +245,10 @@ private static string SanitizeForXmlContext(string? input) =>
                 outputItems.Add(await ExecuteSingleToolCallAsync(functionCallItem, toolCallDepth, endUserId, mcpClient, cancellationToken));
             }
 
-            var continuationStream = _ResponseClient.CreateResponseStreamingAsync(outputItems, continuationOptions, cancellationToken);
+            continuationOptions.InputItems.Clear();
+            foreach (var outputItem in outputItems)
+                continuationOptions.InputItems.Add(outputItem);
+            var continuationStream = _ResponseClient.CreateResponseStreamingAsync(continuationOptions, cancellationToken);
 #pragma warning restore OPENAI001 // Type is for evaluation purposes only and is subject to change or removal in future updates. Suppress this diagnostic to proceed.
 
             await foreach (var result in ProcessStreamingUpdatesAsync(continuationStream, continuationOptions, mcpClient, toolCallDepth + 1, endUserId, cancellationToken))
@@ -338,7 +339,7 @@ private async Task<ResponseItem> ExecuteSingleToolCallAsync(
     /// Creates response options with optional features
     /// </summary>
 #pragma warning disable OPENAI001 // Type is for evaluation purposes only and is subject to change or removal in future updates. Suppress this diagnostic to proceed.
-    private async Task<ResponseCreationOptions> CreateResponseOptionsAsync(
+    private async Task<CreateResponseOptions> CreateResponseOptionsAsync(
         string? systemPrompt = null,
         string? previousResponseId = null,
         IEnumerable<ResponseTool>? tools = null,
@@ -348,7 +349,7 @@ private async Task<ResponseCreationOptions> CreateResponseOptionsAsync(
         CancellationToken cancellationToken = default
         )
     {
-        var options = new ResponseCreationOptions();
+        var options = new CreateResponseOptions();
 #pragma warning restore OPENAI001 // Type is for evaluation purposes only and is subject to change or removal in future updates. Suppress this diagnostic to proceed.
 
         // Set the system prompt via Instructions — this is stateless across turns when using previous_response_id,
@@ -423,7 +424,7 @@ private async Task<ResponseCreationOptions> CreateResponseOptionsAsync(
     private async Task<(string response, string responseId)> GetChatCompletionCore(
         string prompt,
 #pragma warning disable OPENAI001 // Type is for evaluation purposes only and is subject to change or removal in future updates. Suppress this diagnostic to proceed.
-        ResponseCreationOptions responseOptions,
+        CreateResponseOptions responseOptions,
 #pragma warning restore OPENAI001 // Type is for evaluation purposes only and is subject to change or removal in future updates. Suppress this diagnostic to proceed.
         McpClient? mcpClient = null,
         string? endUserId = null,
@@ -436,13 +437,13 @@ private async Task<ResponseCreationOptions> CreateResponseOptionsAsync(
         const int MaxToolCallIterations = 10;
         for (int iteration = 0; iteration < MaxToolCallIterations; iteration++)
         {
-            ClientResult<OpenAIResponse> response;
+            ClientResult<ResponseResult> response;
             try
             {
-                response = await _ResponseClient.CreateResponseAsync(
-                    responseItems,
-                    options: responseOptions,
-                    cancellationToken: cancellationToken);
+                responseOptions.InputItems.Clear();
+                foreach (var responseItem in responseItems)
+                    responseOptions.InputItems.Add(responseItem);
+                response = await _ResponseClient.CreateResponseAsync(responseOptions, cancellationToken);
             }
             catch (ClientResultException ex) when (IsContextLengthError(ex))
             {
@@ -532,16 +533,16 @@ private bool IsMcpToolAllowed(string toolName)
 
     /// <summary>
     /// Returns a clone of <paramref name="source"/> with
-    /// <see cref="ResponseCreationOptions.PreviousResponseId"/> replaced.
+    /// <see cref="CreateResponseOptions.PreviousResponseId"/> replaced.
     /// All behavior-affecting properties are copied so that tool-call continuation legs
     /// produce identical generation behavior to the initial leg.
     /// </summary>
 #pragma warning disable OPENAI001 // Type is for evaluation purposes only and is subject to change or removal in future updates. Suppress this diagnostic to proceed.
-    private static ResponseCreationOptions CloneOptionsWithPreviousResponseId(
-        ResponseCreationOptions source,
+    private static CreateResponseOptions CloneOptionsWithPreviousResponseId(
+        CreateResponseOptions source,
         string? previousResponseId)
     {
-        var clone = new ResponseCreationOptions
+        var clone = new CreateResponseOptions
         {
             Instructions = source.Instructions,
             PreviousResponseId = previousResponseId,